21240929400 has 48 divisors (see below), whose sum is σ = 65846883000. Its totient is φ = 5664247680.

The previous prime is 21240929393. The next prime is 21240929419. The reversal of 21240929400 is 492904212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17700175 + ... + 17701374.

Almost surely, 2^21240929400 is an apocalyptic number.

21240929400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21240929400 is an abundant number, since it is smaller than the sum of its proper divisors (44605953600).

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

21240929400 is a wasteful number, since it uses less digits than its factorization.

21240929400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35401568 (or 35401559 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 21240929400 in words is "twenty-one billion, two hundred forty million, nine hundred twenty-nine thousand, four hundred".