21221002122 has 16 divisors (see below), whose sum is σ = 42447140640. Its totient is φ = 7072811312.

The previous prime is 21221002109. The next prime is 21221002133. The reversal of 21221002122 is 22120012212.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 159228 + ... + 260375.

It is an arithmetic number, because the mean of its divisors is an integer number (2652946290).

Almost surely, 2^21221002122 is an apocalyptic number.

21221002122 is an abundant number, since it is smaller than the sum of its proper divisors (21226138518).

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

21221002122 is a wasteful number, since it uses less digits than its factorization.

21221002122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428037.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21221002122 its reverse (22120012212), we get a palindrome (43341014334).

The spelling of 21221002122 in words is "twenty-one billion, two hundred twenty-one million, two thousand, one hundred twenty-two".