21021212000 has 48 divisors (see below), whose sum is σ = 51649127712. Its totient is φ = 8408483200.

The previous prime is 21021211987. The next prime is 21021212041. The reversal of 21021212000 is 21212012.

It is a happy number.

It is a congruent number.

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, 2623652 + ... + 2631651.

It is an arithmetic number, because the mean of its divisors is an integer number (1076023494).

Almost surely, 2^21021212000 is an apocalyptic number.

21021212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021212000 is an abundant number, since it is smaller than the sum of its proper divisors (30627915712).

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

21021212000 is an equidigital number, since it uses as much as digits as its factorization.

21021212000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255328 (or 5255310 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21021212000 its reverse (21212012), we get a palindrome (21042424012).

The spelling of 21021212000 in words is "twenty-one billion, twenty-one million, two hundred twelve thousand".