21101211102 has 32 divisors (see below), whose sum is σ = 44985945600. Its totient is φ = 6579188928.

The previous prime is 21101211091. The next prime is 21101211179. The reversal of 21101211102 is 20111210112.

It is a super-2 number, since 2×21101211102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 1162503 + ... + 1180514.

It is an arithmetic number, because the mean of its divisors is an integer number (1405810800).

Almost surely, 2^21101211102 is an apocalyptic number.

21101211102 is an abundant number, since it is smaller than the sum of its proper divisors (23884734498).

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

21101211102 is a wasteful number, since it uses less digits than its factorization.

21101211102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343120.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101211102 its reverse (20111210112), we get a palindrome (41212421214).

The spelling of 21101211102 in words is "twenty-one billion, one hundred one million, two hundred eleven thousand, one hundred two".