21122000012 has 48 divisors (see below), whose sum is σ = 39234888000. Its totient is φ = 9931837440.

The previous prime is 21121999993. The next prime is 21122000017. The reversal of 21122000012 is 21000022112.

It is a happy number.

It is a super-2 number, since 2×21122000012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121999957 and 21122000002.

It is not an unprimeable number, because it can be changed into a prime (21122000017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3197489 + ... + 3204087.

It is an arithmetic number, because the mean of its divisors is an integer number (817393500).

Almost surely, 2^21122000012 is an apocalyptic number.

It is an amenable number.

21122000012 is a deficient number, since it is larger than the sum of its proper divisors (18112887988).

21122000012 is a wasteful number, since it uses less digits than its factorization.

21122000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7346 (or 7344 counting only the distinct ones).

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

Adding to 21122000012 its reverse (21000022112), we get a palindrome (42122022124).

The spelling of 21122000012 in words is "twenty-one billion, one hundred twenty-two million, twelve", and thus it is an aban number.