21512425542202 has 80 divisors (see below), whose sum is σ = 38835367183872. Its totient is φ = 8930189671200.

The previous prime is 21512425542197. The next prime is 21512425542323. The reversal of 21512425542202 is 20224552421512.

It is a happy number.

It is a super-3 number, since 3×21512425542202³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39349827 + ... + 39892777.

Almost surely, 2^{21512425542202} is an apocalyptic number.

21512425542202 is a deficient number, since it is larger than the sum of its proper divisors (17322941641670).

21512425542202 is an equidigital number, since it uses as much as digits as its factorization.

21512425542202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543241 (or 543220 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 37.

Adding to 21512425542202 its reverse (20224552421512), we get a palindrome (41736977963714).

The spelling of 21512425542202 in words is "twenty-one trillion, five hundred twelve billion, four hundred twenty-five million, five hundred forty-two thousand, two hundred two".