21002157132 has 96 divisors (see below), whose sum is σ = 54128148480. Its totient is φ = 6285222720.

The previous prime is 21002157103. The next prime is 21002157151. The reversal of 21002157132 is 23175120012.

It is a super-4 number, since 4×21002157132⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3802669 + ... + 3808187.

It is an arithmetic number, because the mean of its divisors is an integer number (563834880).

Almost surely, 2^21002157132 is an apocalyptic number.

21002157132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21002157132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27064074240).

21002157132 is an abundant number, since it is smaller than the sum of its proper divisors (33125991348).

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

21002157132 is a wasteful number, since it uses less digits than its factorization.

21002157132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5891 (or 5889 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

Adding to 21002157132 its reverse (23175120012), we get a palindrome (44177277144).

The spelling of 21002157132 in words is "twenty-one billion, two million, one hundred fifty-seven thousand, one hundred thirty-two".