21021212202 has 16 divisors (see below), whose sum is σ = 42046089120. Its totient is φ = 7006459952.

The previous prime is 21021212141. The next prime is 21021212221. The reversal of 21021212202 is 20221212012.

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, 75093 + ... + 218360.

It is an arithmetic number, because the mean of its divisors is an integer number (2627880570).

Almost surely, 2^21021212202 is an apocalyptic number.

21021212202 is an abundant number, since it is smaller than the sum of its proper divisors (21024876918).

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

21021212202 is a wasteful number, since it uses less digits than its factorization.

21021212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305397.

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

Adding to 21021212202 its reverse (20221212012), we get a palindrome (41242424214).

The spelling of 21021212202 in words is "twenty-one billion, twenty-one million, two hundred twelve thousand, two hundred two".