21623545206454 has 16 divisors (see below), whose sum is σ = 32449245787728. Its totient is φ = 10807130339712.

The previous prime is 21623545206421. The next prime is 21623545206457. The reversal of 21623545206454 is 45460254532612.

It is a super-2 number, since 2×21623545206454² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21623545206398 and 21623545206407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623545206457) 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, 126247477 + ... + 126418639.

It is an arithmetic number, because the mean of its divisors is an integer number (2028077861733).

Almost surely, 2^{21623545206454} is an apocalyptic number.

21623545206454 is a deficient number, since it is larger than the sum of its proper divisors (10825700581274).

21623545206454 is a wasteful number, since it uses less digits than its factorization.

21623545206454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197919.

The product of its (nonzero) digits is 6912000, while the sum is 49.

The spelling of 21623545206454 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred forty-five million, two hundred six thousand, four hundred fifty-four".