21236610431 has 8 divisors (see below), whose sum is σ = 21337430400. Its totient is φ = 21135999640.

The previous prime is 21236610377. The next prime is 21236610433. The reversal of 21236610431 is 13401663212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21236610431 is a prime.

It is a super-2 number, since 2×21236610431² (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 = 21236610394 and 21236610403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236610433) 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 7 ways as a sum of consecutive naturals, for example, 153140 + ... + 256758.

It is an arithmetic number, because the mean of its divisors is an integer number (2667178800).

Almost surely, 2^21236610431 is an apocalyptic number.

21236610431 is a deficient number, since it is larger than the sum of its proper divisors (100819969).

21236610431 is a wasteful number, since it uses less digits than its factorization.

21236610431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104589.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21236610431 in words is "twenty-one billion, two hundred thirty-six million, six hundred ten thousand, four hundred thirty-one".