2152045421 has 4 divisors (see below), whose sum is σ = 2152951644. Its totient is φ = 2151139200.

The previous prime is 2152045403. The next prime is 2152045471. The reversal of 2152045421 is 1245402512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 872552521 + 1279492900 = 29539^2 + 35770^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152045421 - 2²² = 2147851117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2152045471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449540 + ... + 454301.

It is an arithmetic number, because the mean of its divisors is an integer number (538237911).

Almost surely, 2^2152045421 is an apocalyptic number.

It is an amenable number.

2152045421 is a deficient number, since it is larger than the sum of its proper divisors (906223).

2152045421 is an equidigital number, since it uses as much as digits as its factorization.

2152045421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906222.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2152045421 is about 46390.1435759796. The cubic root of 2152045421 is about 1291.0720453597.

Adding to 2152045421 its reverse (1245402512), we get a palindrome (3397447933).

The spelling of 2152045421 in words is "two billion, one hundred fifty-two million, forty-five thousand, four hundred twenty-one".