21819267952623 has 6 divisors (see below), whose sum is σ = 31516720376024. Its totient is φ = 14546178635076.

The previous prime is 21819267952607. The next prime is 21819267952693. The reversal of 21819267952623 is 32625976291812.

21819267952623 is a `hidden beast` number, since 2 + 1 + 8 + 19 + 2 + 6 + 79 + 526 + 23 = 666.

It is not a de Polignac number, because 21819267952623 - 2⁴ = 21819267952607 is a prime.

It is a super-2 number, since 2×21819267952623² (a number of 27 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 (21819267952693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1212181552915 + ... + 1212181552932.

Almost surely, 2^{21819267952623} is an apocalyptic number.

21819267952623 is a deficient number, since it is larger than the sum of its proper divisors (9697452423401).

21819267952623 is a wasteful number, since it uses less digits than its factorization.

21819267952623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424363105853 (or 2424363105850 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

The spelling of 21819267952623 in words is "twenty-one trillion, eight hundred nineteen billion, two hundred sixty-seven million, nine hundred fifty-two thousand, six hundred twenty-three".