21011202231 has 8 divisors (see below), whose sum is σ = 29489406720. Its totient is φ = 13270232952.

The previous prime is 21011202229. The next prime is 21011202263. The reversal of 21011202231 is 13220211012.

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

It is not a de Polignac number, because 21011202231 - 2¹ = 21011202229 is a prime.

It is a super-2 number, since 2×21011202231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21011202231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011202221) 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 7 ways as a sum of consecutive naturals, for example, 184308735 + ... + 184308848.

It is an arithmetic number, because the mean of its divisors is an integer number (3686175840).

Almost surely, 2^21011202231 is an apocalyptic number.

21011202231 is a deficient number, since it is larger than the sum of its proper divisors (8478204489).

21011202231 is a wasteful number, since it uses less digits than its factorization.

21011202231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368617605.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21011202231 its reverse (13220211012), we get a palindrome (34231413243).

The spelling of 21011202231 in words is "twenty-one billion, eleven million, two hundred two thousand, two hundred thirty-one".