21938677517455 has 8 divisors (see below), whose sum is σ = 26326462513104. Its totient is φ = 17550909019200.

The previous prime is 21938677517453. The next prime is 21938677517501. The reversal of 21938677517455 is 55471577683912.

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

It is not a de Polignac number, because 21938677517455 - 2¹ = 21938677517453 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 (21938677517453) 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, 980926 + ... + 6696235.

It is an arithmetic number, because the mean of its divisors is an integer number (3290807814138).

Almost surely, 2^{21938677517455} is an apocalyptic number.

21938677517455 is a deficient number, since it is larger than the sum of its proper divisors (4387784995649).

21938677517455 is an equidigital number, since it uses as much as digits as its factorization.

21938677517455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8248697.

The product of its digits is 444528000, while the sum is 70.

The spelling of 21938677517455 in words is "twenty-one trillion, nine hundred thirty-eight billion, six hundred seventy-seven million, five hundred seventeen thousand, four hundred fifty-five".