21211312000 has 64 divisors (see below), whose sum is σ = 52736664240. Its totient is φ = 8484518400.

The previous prime is 21211311971. The next prime is 21211312021. The reversal of 21211312000 is 21311212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21211312000² (a number of 21 digits) contains 22 as substring.

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, 646854 + ... + 678853.

Almost surely, 2^21211312000 is an apocalyptic number.

21211312000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211312000 is an abundant number, since it is smaller than the sum of its proper divisors (31525352240).

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

21211312000 is an equidigital number, since it uses as much as digits as its factorization.

21211312000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325736 (or 1325714 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21211312000 its reverse (21311212), we get a palindrome (21232623212).

The spelling of 21211312000 in words is "twenty-one billion, two hundred eleven million, three hundred twelve thousand".