2145421512 has 128 divisors (see below), whose sum is σ = 6443136000. Its totient is φ = 657538560.

The previous prime is 2145421483. The next prime is 2145421529. The reversal of 2145421512 is 2151245412.

It is a happy number.

2145421512 is a `hidden beast` number, since 2 + 145 + 4 + 2 + 1 + 512 = 666.

It is a super-2 number, since 2×2145421512² = 9205666928304732288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 787689 + ... + 790407.

It is an arithmetic number, because the mean of its divisors is an integer number (50337000).

Almost surely, 2^2145421512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145421512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3221568000).

2145421512 is an abundant number, since it is smaller than the sum of its proper divisors (4297714488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145421512 is a wasteful number, since it uses less digits than its factorization.

2145421512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028 (or 3018 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 2145421512 is about 46318.6950593386. The cubic root of 2145421512 is about 1289.7460614266.

Adding to 2145421512 its reverse (2151245412), we get a palindrome (4296666924).

The spelling of 2145421512 in words is "two billion, one hundred forty-five million, four hundred twenty-one thousand, five hundred twelve".