21466977632440 has 64 divisors (see below), whose sum is σ = 48982122360000. Its totient is φ = 8465654830080.

The previous prime is 21466977632411. The next prime is 21466977632479. The reversal of 21466977632440 is 4423677966412.

It is a super-2 number, since 2×21466977632440² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226042086 + ... + 226137034.

It is an arithmetic number, because the mean of its divisors is an integer number (765345661875).

Almost surely, 2^{21466977632440} is an apocalyptic number.

21466977632440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21466977632440 is an abundant number, since it is smaller than the sum of its proper divisors (27515144727560).

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

21466977632440 is a wasteful number, since it uses less digits than its factorization.

21466977632440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174640 (or 174636 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 61.

The spelling of 21466977632440 in words is "twenty-one trillion, four hundred sixty-six billion, nine hundred seventy-seven million, six hundred thirty-two thousand, four hundred forty".