21123644601342 has 16 divisors (see below), whose sum is σ = 42447513324672. Its totient is φ = 7007844180120.

The previous prime is 21123644601317. The next prime is 21123644601373. The reversal of 21123644601342 is 24310644632112.

It is a super-2 number, since 2×21123644601342² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21123644601342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8342670378 + ... + 8342672909.

It is an arithmetic number, because the mean of its divisors is an integer number (2652969582792).

Almost surely, 2^{21123644601342} is an apocalyptic number.

21123644601342 is an abundant number, since it is smaller than the sum of its proper divisors (21323868723330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123644601342 is a wasteful number, since it uses less digits than its factorization.

21123644601342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16685343503.

The product of its (nonzero) digits is 165888, while the sum is 39.

The spelling of 21123644601342 in words is "twenty-one trillion, one hundred twenty-three billion, six hundred forty-four million, six hundred one thousand, three hundred forty-two".