21100012002216 has 96 divisors (see below), whose sum is σ = 67728433631040. Its totient is φ = 6028574853888.

The previous prime is 21100012002169. The next prime is 21100012002221. The reversal of 21100012002216 is 61220021000112.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 775266081 + ... + 775293296.

It is an arithmetic number, because the mean of its divisors is an integer number (705504516990).

Almost surely, 2^{21100012002216} is an apocalyptic number.

It is an amenable number.

21100012002216 is an abundant number, since it is smaller than the sum of its proper divisors (46628421628824).

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

21100012002216 is a wasteful number, since it uses less digits than its factorization.

21100012002216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550559405 (or 1550559389 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21100012002216 its reverse (61220021000112), we get a palindrome (82320033002328).

The spelling of 21100012002216 in words is "twenty-one trillion, one hundred billion, twelve million, two thousand, two hundred sixteen".