21221122002 has 32 divisors (see below), whose sum is σ = 44779806720. Its totient is φ = 6685842960.

The previous prime is 21221121991. The next prime is 21221122061. The reversal of 21221122002 is 20022112212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166818 + ... + 265085.

It is an arithmetic number, because the mean of its divisors is an integer number (1399368960).

Almost surely, 2^21221122002 is an apocalyptic number.

21221122002 is an abundant number, since it is smaller than the sum of its proper divisors (23558684718).

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

21221122002 is a wasteful number, since it uses less digits than its factorization.

21221122002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432358.

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

Adding to 21221122002 its reverse (20022112212), we get a palindrome (41243234214).

The spelling of 21221122002 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, two".