21121132400 has 30 divisors (see below), whose sum is σ = 50743521552. Its totient is φ = 8448452800.

The previous prime is 21121132397. The next prime is 21121132451. The reversal of 21121132400 is 423112112.

It is a super-2 number, since 2×21121132400² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26401016 + ... + 26401815.

Almost surely, 2^21121132400 is an apocalyptic number.

21121132400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121132400 is an abundant number, since it is smaller than the sum of its proper divisors (29622389152).

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

21121132400 is a wasteful number, since it uses less digits than its factorization.

21121132400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52802849 (or 52802838 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21121132400 its reverse (423112112), we get a palindrome (21544244512).

The spelling of 21121132400 in words is "twenty-one billion, one hundred twenty-one million, one hundred thirty-two thousand, four hundred".