21010223131 has 4 divisors (see below), whose sum is σ = 21041258112. Its totient is φ = 20979188152.

The previous prime is 21010223063. The next prime is 21010223191. The reversal of 21010223131 is 13132201012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21010223131 - 2¹⁵ = 21010190363 is a prime.

It is a super-2 number, since 2×21010223131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010223191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15516475 + ... + 15517828.

It is an arithmetic number, because the mean of its divisors is an integer number (5260314528).

Almost surely, 2^21010223131 is an apocalyptic number.

21010223131 is a deficient number, since it is larger than the sum of its proper divisors (31034981).

21010223131 is an equidigital number, since it uses as much as digits as its factorization.

21010223131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31034980.

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

Adding to 21010223131 its reverse (13132201012), we get a palindrome (34142424143).

The spelling of 21010223131 in words is "twenty-one billion, ten million, two hundred twenty-three thousand, one hundred thirty-one".