21242400231 has 8 divisors (see below), whose sum is σ = 30501908080. Its totient is φ = 13072246272.

The previous prime is 21242400199. The next prime is 21242400251. The reversal of 21242400231 is 13200424212.

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

It is not a de Polignac number, because 21242400231 - 2⁵ = 21242400199 is a prime.

It is a super-2 number, since 2×21242400231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21242400198 and 21242400207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242400251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272338426 + ... + 272338503.

It is an arithmetic number, because the mean of its divisors is an integer number (3812738510).

Almost surely, 2^21242400231 is an apocalyptic number.

21242400231 is a deficient number, since it is larger than the sum of its proper divisors (9259507849).

21242400231 is a wasteful number, since it uses less digits than its factorization.

21242400231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544676945.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21242400231 its reverse (13200424212), we get a palindrome (34442824443).

The spelling of 21242400231 in words is "twenty-one billion, two hundred forty-two million, four hundred thousand, two hundred thirty-one".