21401433252 has 48 divisors (see below), whose sum is σ = 55561098880. Its totient is φ = 7124052384.

The previous prime is 21401433241. The next prime is 21401433307. The reversal of 21401433252 is 25233410412.

21401433252 is a `hidden beast` number, since 2 + 1 + 401 + 4 + 3 + 3 + 252 = 666.

It is a super-2 number, since 2×21401433252² (a number of 21 digits) 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 15 ways as a sum of consecutive naturals, for example, 56008 + ... + 214335.

Almost surely, 2^21401433252 is an apocalyptic number.

It is an amenable number.

21401433252 is an abundant number, since it is smaller than the sum of its proper divisors (34159665628).

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

21401433252 is a wasteful number, since it uses less digits than its factorization.

21401433252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271089 (or 271081 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21401433252 its reverse (25233410412), we get a palindrome (46634843664).

The spelling of 21401433252 in words is "twenty-one billion, four hundred one million, four hundred thirty-three thousand, two hundred fifty-two".