21221101022202 has 32 divisors (see below), whose sum is σ = 47227047744960. Its totient is φ = 7063343519760.

The previous prime is 21221101022201. The next prime is 21221101022267. The reversal of 21221101022202 is 20222010112212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21221101022201) by changing a digit.

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, 287652249 + ... + 287726012.

It is an arithmetic number, because the mean of its divisors is an integer number (1475845242030).

Almost surely, 2^{21221101022202} is an apocalyptic number.

21221101022202 is an abundant number, since it is smaller than the sum of its proper divisors (26005946722758).

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

21221101022202 is a wasteful number, since it uses less digits than its factorization.

21221101022202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575378955 (or 575378949 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221101022202 its reverse (20222010112212), we get a palindrome (41443111134414).

The spelling of 21221101022202 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, twenty-two thousand, two hundred two".