21247461700 has 36 divisors (see below), whose sum is σ = 46113802000. Its totient is φ = 8497729440.

The previous prime is 21247461667. The next prime is 21247461727. The reversal of 21247461700 is 716474212.

It is a happy 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, 977551 + ... + 999049.

Almost surely, 2^21247461700 is an apocalyptic number.

21247461700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21247461700 is an abundant number, since it is smaller than the sum of its proper divisors (24866340300).

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

21247461700 is a wasteful number, since it uses less digits than its factorization.

21247461700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31396 (or 31389 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

It can be divided in two parts, 2124 and 7461700, that added together give a square (7463824 = 2732²).

The spelling of 21247461700 in words is "twenty-one billion, two hundred forty-seven million, four hundred sixty-one thousand, seven hundred".