21095121102 has 16 divisors (see below), whose sum is σ = 46025718912. Its totient is φ = 6392460920.

The previous prime is 21095121023. The next prime is 21095121119. The reversal of 21095121102 is 20112159012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159811458 + ... + 159811589.

It is an arithmetic number, because the mean of its divisors is an integer number (2876607432).

Almost surely, 2^21095121102 is an apocalyptic number.

21095121102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21095121102 is an abundant number, since it is smaller than the sum of its proper divisors (24930597810).

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

21095121102 is a wasteful number, since it uses less digits than its factorization.

21095121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319623063.

The product of its (nonzero) digits is 360, while the sum is 24.

The spelling of 21095121102 in words is "twenty-one billion, ninety-five million, one hundred twenty-one thousand, one hundred two".