21102026431 has 8 divisors (see below), whose sum is σ = 21132490320. Its totient is φ = 21071583168.

The previous prime is 21102026333. The next prime is 21102026459. The reversal of 21102026431 is 13462020112.

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-21102026431 is a prime.

It is a super-2 number, since 2×21102026431² (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 (21102026531) 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, 3914520 + ... + 3919906.

It is an arithmetic number, because the mean of its divisors is an integer number (2641561290).

Almost surely, 2^21102026431 is an apocalyptic number.

21102026431 is a deficient number, since it is larger than the sum of its proper divisors (30463889).

21102026431 is an equidigital number, since it uses as much as digits as its factorization.

21102026431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10313.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21102026431 its reverse (13462020112), we get a palindrome (34564046543).

The spelling of 21102026431 in words is "twenty-one billion, one hundred two million, twenty-six thousand, four hundred thirty-one".