21661101150500 has 48 divisors (see below), whose sum is σ = 54066108480384. Its totient is φ = 7426663250400.

The previous prime is 21661101150427. The next prime is 21661101150503. The reversal of 21661101150500 is 505110116612.

It is not an unprimeable number, because it can be changed into a prime (21661101150503) by changing a digit.

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, 3094439522 + ... + 3094446521.

It is an arithmetic number, because the mean of its divisors is an integer number (1126377260008).

Almost surely, 2^{21661101150500} is an apocalyptic number.

21661101150500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21661101150500 is an abundant number, since it is smaller than the sum of its proper divisors (32405007329884).

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

21661101150500 is a wasteful number, since it uses less digits than its factorization.

21661101150500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6188886069 (or 6188886057 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 29.

The spelling of 21661101150500 in words is "twenty-one trillion, six hundred sixty-one billion, one hundred one million, one hundred fifty thousand, five hundred".