21106536816180 has 72 divisors (see below), whose sum is σ = 59239715344992. Its totient is φ = 5614974056384.

The previous prime is 21106536816107. The next prime is 21106536816191. The reversal of 21106536816180 is 8161863560112.

It is a super-2 number, since 2×21106536816180² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9531799 + ... + 11535521.

It is an arithmetic number, because the mean of its divisors is an integer number (822773824236).

Almost surely, 2^{21106536816180} is an apocalyptic number.

21106536816180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21106536816180 is an abundant number, since it is smaller than the sum of its proper divisors (38133178528812).

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

21106536816180 is a wasteful number, since it uses less digits than its factorization.

21106536816180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004573 (or 2004152 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 21106536816180 in words is "twenty-one trillion, one hundred six billion, five hundred thirty-six million, eight hundred sixteen thousand, one hundred eighty".