21221102100202 has 16 divisors (see below), whose sum is σ = 32440681533312. Its totient is φ = 10407645677520.

The previous prime is 21221102100157. The next prime is 21221102100239. The reversal of 21221102100202 is 20200120112212.

It is a happy 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, 25612374 + ... + 26427937.

It is an arithmetic number, because the mean of its divisors is an integer number (2027542595832).

Almost surely, 2^{21221102100202} is an apocalyptic number.

21221102100202 is a deficient number, since it is larger than the sum of its proper divisors (11219579433110).

21221102100202 is a wasteful number, since it uses less digits than its factorization.

21221102100202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52044213.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221102100202 its reverse (20200120112212), we get a palindrome (41421222212414).

The spelling of 21221102100202 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred thousand, two hundred two".