21857059990 has 8 divisors (see below), whose sum is σ = 39342708000. Its totient is φ = 8742823992.

The previous prime is 21857059969. The next prime is 21857059993. The reversal of 21857059990 is 9995075812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21857059993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1092852990 + ... + 1092853009.

It is an arithmetic number, because the mean of its divisors is an integer number (4917838500).

Almost surely, 2^21857059990 is an apocalyptic number.

21857059990 is a deficient number, since it is larger than the sum of its proper divisors (17485648010).

21857059990 is a wasteful number, since it uses less digits than its factorization.

21857059990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185706006.

The product of its (nonzero) digits is 2041200, while the sum is 55.

The spelling of 21857059990 in words is "twenty-one billion, eight hundred fifty-seven million, fifty-nine thousand, nine hundred ninety".