21900385670 has 8 divisors (see below), whose sum is σ = 39420694224. Its totient is φ = 8760154264.

The previous prime is 21900385657. The next prime is 21900385673. The reversal of 21900385670 is 7658300912.

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 (21900385673) 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, 1095019274 + ... + 1095019293.

It is an arithmetic number, because the mean of its divisors is an integer number (4927586778).

Almost surely, 2^21900385670 is an apocalyptic number.

21900385670 is a deficient number, since it is larger than the sum of its proper divisors (17520308554).

21900385670 is a wasteful number, since it uses less digits than its factorization.

21900385670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190038574.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 21900385670 in words is "twenty-one billion, nine hundred million, three hundred eighty-five thousand, six hundred seventy".