21211054751 has 8 divisors (see below), whose sum is σ = 22461598080. Its totient is φ = 19960826368.

The previous prime is 21211054747. The next prime is 21211054783. The reversal of 21211054751 is 15745011212.

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

It is a cyclic number.

It is not a de Polignac number, because 21211054751 - 2² = 21211054747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211054741) 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, 67730 + ... + 216816.

It is an arithmetic number, because the mean of its divisors is an integer number (2807699760).

Almost surely, 2^21211054751 is an apocalyptic number.

21211054751 is a deficient number, since it is larger than the sum of its proper divisors (1250543329).

21211054751 is a wasteful number, since it uses less digits than its factorization.

21211054751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157473.

The product of its (nonzero) digits is 2800, while the sum is 29.

Adding to 21211054751 its reverse (15745011212), we get a palindrome (36956065963).

The spelling of 21211054751 in words is "twenty-one billion, two hundred eleven million, fifty-four thousand, seven hundred fifty-one".