21401200231 has 4 divisors (see below), whose sum is σ = 21402073152. Its totient is φ = 21400327312.

The previous prime is 21401200217. The next prime is 21401200273. The reversal of 21401200231 is 13200210412.

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 21401200231 - 2¹¹ = 21401198183 is a prime.

It is a super-2 number, since 2×21401200231² (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 (21401200211) 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, 398590 + ... + 449083.

It is an arithmetic number, because the mean of its divisors is an integer number (5350518288).

Almost surely, 2^21401200231 is an apocalyptic number.

21401200231 is a deficient number, since it is larger than the sum of its proper divisors (872921).

21401200231 is an equidigital number, since it uses as much as digits as its factorization.

21401200231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872920.

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

Adding to 21401200231 its reverse (13200210412), we get a palindrome (34601410643).

The spelling of 21401200231 in words is "twenty-one billion, four hundred one million, two hundred thousand, two hundred thirty-one".