21867388961380 has 48 divisors (see below), whose sum is σ = 47596198512240. Its totient is φ = 8429126451200.

The previous prime is 21867388961321. The next prime is 21867388961437. The reversal of 21867388961380 is 8316988376812.

It can be written as a sum of positive squares in 8 ways, for example, as 109810053376 + 21757578908004 = 331376^2 + 4664502^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35880541 + ... + 36484900.

It is an arithmetic number, because the mean of its divisors is an integer number (991587469005).

Almost surely, 2^{21867388961380} is an apocalyptic number.

21867388961380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21867388961380 is an abundant number, since it is smaller than the sum of its proper divisors (25728809550860).

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

21867388961380 is a wasteful number, since it uses less digits than its factorization.

21867388961380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72366000 (or 72365998 counting only the distinct ones).

The product of its (nonzero) digits is 167215104, while the sum is 70.

The spelling of 21867388961380 in words is "twenty-one trillion, eight hundred sixty-seven billion, three hundred eighty-eight million, nine hundred sixty-one thousand, three hundred eighty".