11645255421 has 24 divisors (see below), whose sum is σ = 17349803640. Its totient is φ = 7521209856.

The previous prime is 11645255417. The next prime is 11645255429. The reversal of 11645255421 is 12455254611.

11645255421 is a `hidden beast` number, since 1 + 1 + 64 + 52 + 5 + 542 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 469805625 + 11175449796 = 21675^2 + 105714^2 .

It is not a de Polignac number, because 11645255421 - 2² = 11645255417 is a prime.

It is a super-2 number, since 2×11645255421² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11645255429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2545 + ... + 152633.

It is an arithmetic number, because the mean of its divisors is an integer number (722908485).

Almost surely, 2^11645255421 is an apocalyptic number.

It is an amenable number.

11645255421 is a deficient number, since it is larger than the sum of its proper divisors (5704548219).

11645255421 is a wasteful number, since it uses less digits than its factorization.

11645255421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150365 (or 150362 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The spelling of 11645255421 in words is "eleven billion, six hundred forty-five million, two hundred fifty-five thousand, four hundred twenty-one".