21102133431 has 8 divisors (see below), whose sum is σ = 28139350144. Its totient is φ = 14066502840.

The previous prime is 21102133397. The next prime is 21102133469. The reversal of 21102133431 is 13433120112.

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

It is not a de Polignac number, because 21102133431 - 2¹⁰ = 21102132407 is a prime.

It is a super-4 number, since 4×21102133431⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102133398 and 21102133407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102133471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365131 + ... + 418956.

It is an arithmetic number, because the mean of its divisors is an integer number (3517418768).

Almost surely, 2^21102133431 is an apocalyptic number.

21102133431 is a deficient number, since it is larger than the sum of its proper divisors (7037216713).

21102133431 is an equidigital number, since it uses as much as digits as its factorization.

21102133431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793061.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21102133431 its reverse (13433120112), we get a palindrome (34535253543).

The spelling of 21102133431 in words is "twenty-one billion, one hundred two million, one hundred thirty-three thousand, four hundred thirty-one".