21154372152 has 32 divisors (see below), whose sum is σ = 55669401600. Its totient is φ = 6680327904.

The previous prime is 21154372111. The next prime is 21154372157. The reversal of 21154372152 is 25127345112.

It is a happy number.

It is a super-2 number, since 2×21154372152² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154372157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23195128 + ... + 23196039.

It is an arithmetic number, because the mean of its divisors is an integer number (1739668800).

Almost surely, 2^21154372152 is an apocalyptic number.

It is an amenable number.

21154372152 is an abundant number, since it is smaller than the sum of its proper divisors (34515029448).

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

21154372152 is a wasteful number, since it uses less digits than its factorization.

21154372152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46391195 (or 46391191 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The spelling of 21154372152 in words is "twenty-one billion, one hundred fifty-four million, three hundred seventy-two thousand, one hundred fifty-two".