21857750104 has 8 divisors (see below), whose sum is σ = 40983281460. Its totient is φ = 10928875048.

The previous prime is 21857750093. The next prime is 21857750113. The reversal of 21857750104 is 40105775812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21857750104² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1366109374 + ... + 1366109389.

Almost surely, 2^21857750104 is an apocalyptic number.

It is an amenable number.

21857750104 is a deficient number, since it is larger than the sum of its proper divisors (19125531356).

21857750104 is a wasteful number, since it uses less digits than its factorization.

21857750104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732218769 (or 2732218765 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 40.

The spelling of 21857750104 in words is "twenty-one billion, eight hundred fifty-seven million, seven hundred fifty thousand, one hundred four".