21000010022231 has 4 divisors (see below), whose sum is σ = 21011379818352. Its totient is φ = 20988640226112.

The previous prime is 21000010022197. The next prime is 21000010022279. The reversal of 21000010022231 is 13222001000012.

It is a happy number.

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 21000010022231 - 2¹⁸ = 21000009760087 is a prime.

It is a super-2 number, since 2×21000010022231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000010022731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5684895290 + ... + 5684898983.

It is an arithmetic number, because the mean of its divisors is an integer number (5252844954588).

Almost surely, 2^{21000010022231} is an apocalyptic number.

21000010022231 is a deficient number, since it is larger than the sum of its proper divisors (11369796121).

21000010022231 is a wasteful number, since it uses less digits than its factorization.

21000010022231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11369796120.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21000010022231 its reverse (13222001000012), we get a palindrome (34222011022243).

The spelling of 21000010022231 in words is "twenty-one trillion, ten million, twenty-two thousand, two hundred thirty-one".