21021202221102 has 32 divisors (see below), whose sum is σ = 46772394832800. Its totient is φ = 6998275589184.

The previous prime is 21021202221101. The next prime is 21021202221109. The reversal of 21021202221102 is 20112220212012.

It is a happy number.

21021202221102 is a `hidden beast` number, since 210 + 2 + 120 + 222 + 110 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021202221101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244173727 + ... + 244259802.

It is an arithmetic number, because the mean of its divisors is an integer number (1461637338525).

Almost surely, 2^{21021202221102} is an apocalyptic number.

21021202221102 is an abundant number, since it is smaller than the sum of its proper divisors (25751192611698).

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

21021202221102 is a wasteful number, since it uses less digits than its factorization.

21021202221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488434337 (or 488434331 counting only the distinct ones).

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

Adding to 21021202221102 its reverse (20112220212012), we get a palindrome (41133422433114).

The spelling of 21021202221102 in words is "twenty-one trillion, twenty-one billion, two hundred two million, two hundred twenty-one thousand, one hundred two".