21351634152 has 32 divisors (see below), whose sum is σ = 55100993280. Its totient is φ = 6887623680.

The previous prime is 21351634099. The next prime is 21351634153. The reversal of 21351634152 is 25143615312.

It is a super-4 number, since 4×21351634152⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21351634153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14348473 + ... + 14349960.

It is an arithmetic number, because the mean of its divisors is an integer number (1721906040).

Almost surely, 2^21351634152 is an apocalyptic number.

It is an amenable number.

21351634152 is an abundant number, since it is smaller than the sum of its proper divisors (33749359128).

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

21351634152 is a wasteful number, since it uses less digits than its factorization.

21351634152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28698473 (or 28698469 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The spelling of 21351634152 in words is "twenty-one billion, three hundred fifty-one million, six hundred thirty-four thousand, one hundred fifty-two".