21873758404 has 6 divisors (see below), whose sum is σ = 38279077214. Its totient is φ = 10936879200.

The previous prime is 21873758381. The next prime is 21873758429. The reversal of 21873758404 is 40485737812.

It can be written as a sum of positive squares in only one way, i.e., 18854036100 + 3019722304 = 137310^2 + 54952^2 .

It is a super-2 number, since 2×21873758404² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2734219797 + ... + 2734219804.

Almost surely, 2^21873758404 is an apocalyptic number.

It is an amenable number.

21873758404 is a deficient number, since it is larger than the sum of its proper divisors (16405318810).

21873758404 is a wasteful number, since it uses less digits than its factorization.

21873758404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468439605 (or 5468439603 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 21873758404 in words is "twenty-one billion, eight hundred seventy-three million, seven hundred fifty-eight thousand, four hundred four".