21084463760 has 20 divisors (see below), whose sum is σ = 49021378428. Its totient is φ = 8433785472.

The previous prime is 21084463759. The next prime is 21084463789. The reversal of 21084463760 is 6736448012.

It can be written as a sum of positive squares in 2 ways, for example, as 7661851024 + 13422612736 = 87532^2 + 115856^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×21084463760² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131777819 + ... + 131777978.

Almost surely, 2^21084463760 is an apocalyptic number.

21084463760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21084463760 is an abundant number, since it is smaller than the sum of its proper divisors (27936914668).

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

21084463760 is a wasteful number, since it uses less digits than its factorization.

21084463760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263555810 (or 263555804 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 21084463760 in words is "twenty-one billion, eighty-four million, four hundred sixty-three thousand, seven hundred sixty".