21122012000 has 48 divisors (see below), whose sum is σ = 51896793312. Its totient is φ = 8448803200.

The previous prime is 21122011991. The next prime is 21122012053. The reversal of 21122012000 is 21022112.

It is a happy number.

It is a super-2 number, since 2×21122012000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2636252 + ... + 2644251.

It is an arithmetic number, because the mean of its divisors is an integer number (1081183194).

Almost surely, 2^21122012000 is an apocalyptic number.

21122012000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122012000 is an abundant number, since it is smaller than the sum of its proper divisors (30774781312).

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

21122012000 is an equidigital number, since it uses as much as digits as its factorization.

21122012000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5280528 (or 5280510 counting only the distinct ones).

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

Adding to 21122012000 its reverse (21022112), we get a palindrome (21143034112).

The spelling of 21122012000 in words is "twenty-one billion, one hundred twenty-two million, twelve thousand".