21212202000 has 160 divisors (see below), whose sum is σ = 74605474944. Its totient is φ = 5142336000.

The previous prime is 21212201963. The next prime is 21212202041. The reversal of 21212202000 is 20221212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94699 + ... + 226698.

Almost surely, 2^21212202000 is an apocalyptic number.

21212202000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212202000 is an abundant number, since it is smaller than the sum of its proper divisors (53393272944).

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

21212202000 is a wasteful number, since it uses less digits than its factorization.

21212202000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321434 (or 321418 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21212202000 its reverse (20221212), we get a palindrome (21232423212).

The spelling of 21212202000 in words is "twenty-one billion, two hundred twelve million, two hundred two thousand".