1245225421 has 8 divisors (see below), whose sum is σ = 1358708544. Its totient is φ = 1131789120.

The previous prime is 1245225419. The next prime is 1245225427.

It is a happy number.

1245225421 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1245225421 - 2¹ = 1245225419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245225421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245225427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66880 + ... + 83446.

It is an arithmetic number, because the mean of its divisors is an integer number (169838568).

Almost surely, 2^1245225421 is an apocalyptic number.

1245225421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1245225421 is a deficient number, since it is larger than the sum of its proper divisors (113483123).

1245225421 is a wasteful number, since it uses less digits than its factorization.

1245225421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23411.

The product of its digits is 6400, while the sum is 28.

The square root of 1245225421 is about 35287.7517135904. The cubic root of 1245225421 is about 1075.8440592155.

It can be divided in two parts, 12452 and 25421, that added together give a palindrome (37873).

The spelling of 1245225421 in words is "one billion, two hundred forty-five million, two hundred twenty-five thousand, four hundred twenty-one".