21331201012 has 12 divisors (see below), whose sum is σ = 40723202016. Its totient is φ = 9696000440.

The previous prime is 21331200997. The next prime is 21331201043. The reversal of 21331201012 is 21010213312.

It is a super-2 number, since 2×21331201012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242399968 + ... + 242400055.

It is an arithmetic number, because the mean of its divisors is an integer number (3393600168).

Almost surely, 2^21331201012 is an apocalyptic number.

21331201012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21331201012 is a deficient number, since it is larger than the sum of its proper divisors (19392001004).

21331201012 is a wasteful number, since it uses less digits than its factorization.

21331201012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484800038 (or 484800036 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21331201012 its reverse (21010213312), we get a palindrome (42341414324).

The spelling of 21331201012 in words is "twenty-one billion, three hundred thirty-one million, two hundred one thousand, twelve".