21012131033 has 4 divisors (see below), whose sum is σ = 21012473088. Its totient is φ = 21011788980.

The previous prime is 21012131011. The next prime is 21012131051. The reversal of 21012131033 is 33013121012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21012131033 - 2¹⁶ = 21012065497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012131083) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 50633 + ... + 211158.

It is an arithmetic number, because the mean of its divisors is an integer number (5253118272).

Almost surely, 2^21012131033 is an apocalyptic number.

It is an amenable number.

21012131033 is a deficient number, since it is larger than the sum of its proper divisors (342055).

21012131033 is an equidigital number, since it uses as much as digits as its factorization.

21012131033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342054.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21012131033 its reverse (33013121012), we get a palindrome (54025252045).

The spelling of 21012131033 in words is "twenty-one billion, twelve million, one hundred thirty-one thousand, thirty-three".