21121110101210 has 80 divisors (see below), whose sum is σ = 44363894488992. Its totient is φ = 7239531146400.

The previous prime is 21121110101111. The next prime is 21121110101303. The reversal of 21121110101210 is 1210101112112.

It is a super-2 number, since 2×21121110101210² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 88501745 + ... + 88740075.

Almost surely, 2^{21121110101210} is an apocalyptic number.

21121110101210 is an abundant number, since it is smaller than the sum of its proper divisors (23242784387782).

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

21121110101210 is an equidigital number, since it uses as much as digits as its factorization.

21121110101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242057 (or 242036 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21121110101210 its reverse (1210101112112), we get a palindrome (22331211213322).

The spelling of 21121110101210 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, one hundred one thousand, two hundred ten".