21012313101 has 16 divisors (see below), whose sum is σ = 30178276800. Its totient is φ = 12927761280.

The previous prime is 21012313079. The next prime is 21012313111. The reversal of 21012313101 is 10131321012.

It is a happy number.

It is not a de Polignac number, because 21012313101 - 2¹⁸ = 21012050957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012313111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123366 + ... + 239256.

It is an arithmetic number, because the mean of its divisors is an integer number (1886142300).

Almost surely, 2^21012313101 is an apocalyptic number.

It is an amenable number.

21012313101 is a deficient number, since it is larger than the sum of its proper divisors (9165963699).

21012313101 is a wasteful number, since it uses less digits than its factorization.

21012313101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120556.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21012313101 its reverse (10131321012), we get a palindrome (31143634113).

The spelling of 21012313101 in words is "twenty-one billion, twelve million, three hundred thirteen thousand, one hundred one".