21221102100102 has 16 divisors (see below), whose sum is σ = 42443122682352. Its totient is φ = 7073547619680.

The previous prime is 21221102100097. The next prime is 21221102100103. The reversal of 21221102100102 is 20100120112212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221102100103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37969549 + ... + 38524392.

It is an arithmetic number, because the mean of its divisors is an integer number (2652695167647).

Almost surely, 2^{21221102100102} is an apocalyptic number.

21221102100102 is an abundant number, since it is smaller than the sum of its proper divisors (21222020582250).

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

21221102100102 is a wasteful number, since it uses less digits than its factorization.

21221102100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76540183.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221102100102 its reverse (20100120112212), we get a palindrome (41321222212314).

The spelling of 21221102100102 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred thousand, one hundred two".