21321011012 has 48 divisors (see below), whose sum is σ = 43959054720. Its totient is φ = 8859601152.

The previous prime is 21321010981. The next prime is 21321011053. The reversal of 21321011012 is 21011012312.

It is a Harshad number since it is a multiple of its sum of digits (14).

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 15 ways as a sum of consecutive naturals, for example, 32198 + ... + 208994.

It is an arithmetic number, because the mean of its divisors is an integer number (915813640).

Almost surely, 2^21321011012 is an apocalyptic number.

It is an amenable number.

21321011012 is an abundant number, since it is smaller than the sum of its proper divisors (22638043708).

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

21321011012 is a wasteful number, since it uses less digits than its factorization.

21321011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176940 (or 176938 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21321011012 its reverse (21011012312), we get a palindrome (42332023324).

The spelling of 21321011012 in words is "twenty-one billion, three hundred twenty-one million, eleven thousand, twelve".