21211121012 has 12 divisors (see below), whose sum is σ = 37982705376. Its totient is φ = 10358919480.

The previous prime is 21211121003. The next prime is 21211121021. The reversal of 21211121012 is 21012111212.

It is an interprime number because it is at equal distance from previous prime (21211121003) and next prime (21211121021).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61660064 + ... + 61660407.

It is an arithmetic number, because the mean of its divisors is an integer number (3165225448).

Almost surely, 2^21211121012 is an apocalyptic number.

It is an amenable number.

21211121012 is a deficient number, since it is larger than the sum of its proper divisors (16771584364).

21211121012 is a wasteful number, since it uses less digits than its factorization.

21211121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123320518 (or 123320516 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21211121012 its reverse (21012111212), we get a palindrome (42223232224).

The spelling of 21211121012 in words is "twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, twelve".