21623064252542 has 4 divisors (see below), whose sum is σ = 32434596378816. Its totient is φ = 10811532126270.

The previous prime is 21623064252509. The next prime is 21623064252563. The reversal of 21623064252542 is 24525246032612.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21623064252493 and 21623064252502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5405766063134 + ... + 5405766063137.

It is an arithmetic number, because the mean of its divisors is an integer number (8108649094704).

Almost surely, 2^{21623064252542} is an apocalyptic number.

21623064252542 is a deficient number, since it is larger than the sum of its proper divisors (10811532126274).

21623064252542 is a wasteful number, since it uses less digits than its factorization.

21623064252542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10811532126273.

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 21623064252542 in words is "twenty-one trillion, six hundred twenty-three billion, sixty-four million, two hundred fifty-two thousand, five hundred forty-two".