21100001212210 has 64 divisors (see below), whose sum is σ = 40659570000000. Its totient is φ = 7859685947904.

The previous prime is 21100001212139. The next prime is 21100001212231. The reversal of 21100001212210 is 1221210000112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169758166 + ... + 169882414.

It is an arithmetic number, because the mean of its divisors is an integer number (635305781250).

Almost surely, 2^{21100001212210} is an apocalyptic number.

21100001212210 is a deficient number, since it is larger than the sum of its proper divisors (19559568787790).

21100001212210 is a wasteful number, since it uses less digits than its factorization.

21100001212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139483.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21100001212210 its reverse (1221210000112), we get a palindrome (22321211212322).

The spelling of 21100001212210 in words is "twenty-one trillion, one hundred billion, one million, two hundred twelve thousand, two hundred ten".