21243525135 has 32 divisors (see below), whose sum is σ = 38852946432. Its totient is φ = 9709415040.

The previous prime is 21243525103. The next prime is 21243525143. The reversal of 21243525135 is 53152534212.

It is not a de Polignac number, because 21243525135 - 2⁵ = 21243525103 is a prime.

It is a super-2 number, since 2×21243525135² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21243525096 and 21243525105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 611092 + ... + 644918.

It is an arithmetic number, because the mean of its divisors is an integer number (1214154576).

Almost surely, 2^21243525135 is an apocalyptic number.

21243525135 is a deficient number, since it is larger than the sum of its proper divisors (17609421297).

21243525135 is a wasteful number, since it uses less digits than its factorization.

21243525135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39823.

The product of its digits is 36000, while the sum is 33.

The spelling of 21243525135 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-five thousand, one hundred thirty-five".