21873187826884 has 27 divisors (see below), whose sum is σ = 38376528807981. Its totient is φ = 10908537322320.

The previous prime is 21873187826857. The next prime is 21873187826891. The reversal of 21873187826884 is 48862878137812.

The square root of 21873187826884 is 4676878.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6884210993284 + 14988976833600 = 2623778^2 + 3871560^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3919220974 + ... + 3919226554.

Almost surely, 2^{21873187826884} is an apocalyptic number.

21873187826884 is the 4676878-th square number.

It is an amenable number.

21873187826884 is a deficient number, since it is larger than the sum of its proper divisors (16503340981097).

21873187826884 is an frugal number, since it uses more digits than its factorization.

21873187826884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12004 (or 6002 counting only the distinct ones).

The product of its digits is 462422016, while the sum is 73.

The spelling of 21873187826884 in words is "twenty-one trillion, eight hundred seventy-three billion, one hundred eighty-seven million, eight hundred twenty-six thousand, eight hundred eighty-four".