21022012231 has 8 divisors (see below), whose sum is σ = 22950480528. Its totient is φ = 19096440000.

The previous prime is 21022012177. The next prime is 21022012247. The reversal of 21022012231 is 13221022012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21022012231 - 2⁷ = 21022012103 is a prime.

It is a super-2 number, since 2×21022012231² (a number of 21 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 (21022012261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 708820 + ... + 737881.

It is an arithmetic number, because the mean of its divisors is an integer number (2868810066).

Almost surely, 2^21022012231 is an apocalyptic number.

21022012231 is a deficient number, since it is larger than the sum of its proper divisors (1928468297).

21022012231 is a wasteful number, since it uses less digits than its factorization.

21022012231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448033.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21022012231 its reverse (13221022012), we get a palindrome (34243034243).

The spelling of 21022012231 in words is "twenty-one billion, twenty-two million, twelve thousand, two hundred thirty-one".