21179887776001 has 6 divisors (see below), whose sum is σ = 22353288761202. Its totient is φ = 20065156840080.

The previous prime is 21179887775957. The next prime is 21179887776011. The reversal of 21179887776001 is 10067778897112.

It can be written as a sum of positive squares in only one way, i.e., 17412251494401 + 3767636281600 = 4172799^2 + 1941040^2 .

It is not a de Polignac number, because 21179887776001 - 2¹⁵ = 21179887743233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21179887776011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29335024260 + ... + 29335024981.

It is an arithmetic number, because the mean of its divisors is an integer number (3725548126867).

Almost surely, 2^{21179887776001} is an apocalyptic number.

It is an amenable number.

21179887776001 is a deficient number, since it is larger than the sum of its proper divisors (1173400985201).

21179887776001 is an equidigital number, since it uses as much as digits as its factorization.

21179887776001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58670049279 (or 58670049260 counting only the distinct ones).

The product of its (nonzero) digits is 16595712, while the sum is 64.

It can be divided in two parts, 2117988 and 7776001, that added together give a palindrome (9893989).

The spelling of 21179887776001 in words is "twenty-one trillion, one hundred seventy-nine billion, eight hundred eighty-seven million, seven hundred seventy-six thousand, one".