21351436652 has 48 divisors (see below), whose sum is σ = 46004404992. Its totient is φ = 8443656000.

The previous prime is 21351436649. The next prime is 21351436679. The reversal of 21351436652 is 25663415312.

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, 1174343 + ... + 1192385.

It is an arithmetic number, because the mean of its divisors is an integer number (958425104).

Almost surely, 2^21351436652 is an apocalyptic number.

It is an amenable number.

21351436652 is an abundant number, since it is smaller than the sum of its proper divisors (24652968340).

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

21351436652 is a wasteful number, since it uses less digits than its factorization.

21351436652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21318 (or 21316 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The spelling of 21351436652 in words is "twenty-one billion, three hundred fifty-one million, four hundred thirty-six thousand, six hundred fifty-two".