21138534627376 has 10 divisors (see below), whose sum is σ = 40955910840572. Its totient is φ = 10569267313680.

The previous prime is 21138534627319. The next prime is 21138534627377. The reversal of 21138534627376 is 67372643583112.

It is a self number, because there is not a number n which added to its sum of digits gives 21138534627376.

It is not an unprimeable number, because it can be changed into a prime (21138534627377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660579207090 + ... + 660579207121.

Almost surely, 2^{21138534627376} is an apocalyptic number.

It is an amenable number.

21138534627376 is a deficient number, since it is larger than the sum of its proper divisors (19817376213196).

21138534627376 is a wasteful number, since it uses less digits than its factorization.

21138534627376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321158414219 (or 1321158414213 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 58.

The spelling of 21138534627376 in words is "twenty-one trillion, one hundred thirty-eight billion, five hundred thirty-four million, six hundred twenty-seven thousand, three hundred seventy-six".