21212200402 has 16 divisors (see below), whose sum is σ = 32331862080. Its totient is φ = 10435292208.

The previous prime is 21212200393. The next prime is 21212200417. The reversal of 21212200402 is 20400221212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18088 + ... + 206764.

It is an arithmetic number, because the mean of its divisors is an integer number (2020741380).

Almost surely, 2^21212200402 is an apocalyptic number.

21212200402 is a deficient number, since it is larger than the sum of its proper divisors (11119661678).

21212200402 is a wasteful number, since it uses less digits than its factorization.

21212200402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189585.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21212200402 its reverse (20400221212), we get a palindrome (41612421614).

The spelling of 21212200402 in words is "twenty-one billion, two hundred twelve million, two hundred thousand, four hundred two".