21430751836 has 24 divisors (see below), whose sum is σ = 40448449440. Its totient is φ = 9876489792.

The previous prime is 21430751827. The next prime is 21430751843. The reversal of 21430751836 is 63815703412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269176 + ... + 339583.

It is an arithmetic number, because the mean of its divisors is an integer number (1685352060).

Almost surely, 2^21430751836 is an apocalyptic number.

21430751836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21430751836 is a deficient number, since it is larger than the sum of its proper divisors (19017697604).

21430751836 is a wasteful number, since it uses less digits than its factorization.

21430751836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609453 (or 609451 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21430751836 in words is "twenty-one billion, four hundred thirty million, seven hundred fifty-one thousand, eight hundred thirty-six".