21434551025512 has 16 divisors (see below), whose sum is σ = 40208589841860. Its totient is φ = 10712260401024.

The previous prime is 21434551025497. The next prime is 21434551025521. The reversal of 21434551025512 is 21552015543412.

It can be written as a sum of positive squares in 2 ways, for example, as 18662106241156 + 2772444784356 = 4319966^2 + 1665066^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626870803 + ... + 626904994.

Almost surely, 2^{21434551025512} is an apocalyptic number.

It is an amenable number.

21434551025512 is a deficient number, since it is larger than the sum of its proper divisors (18774038816348).

21434551025512 is a wasteful number, since it uses less digits than its factorization.

21434551025512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253777940 (or 1253777936 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

Adding to 21434551025512 its reverse (21552015543412), we get a palindrome (42986566568924).

The spelling of 21434551025512 in words is "twenty-one trillion, four hundred thirty-four billion, five hundred fifty-one million, twenty-five thousand, five hundred twelve".