21320100012 has 24 divisors (see below), whose sum is σ = 49903839216. Its totient is φ = 7084280128.

The previous prime is 21320100001. The next prime is 21320100023. The reversal of 21320100012 is 21000102312.

It is an interprime number because it is at equal distance from previous prime (21320100001) and next prime (21320100023).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2798523 + ... + 2806130.

It is an arithmetic number, because the mean of its divisors is an integer number (2079326634).

Almost surely, 2^21320100012 is an apocalyptic number.

It is an amenable number.

21320100012 is an abundant number, since it is smaller than the sum of its proper divisors (28583739204).

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

21320100012 is a wasteful number, since it uses less digits than its factorization.

21320100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5604977 (or 5604975 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21320100012 its reverse (21000102312), we get a palindrome (42320202324).

The spelling of 21320100012 in words is "twenty-one billion, three hundred twenty million, one hundred thousand, twelve".