21350803990 has 8 divisors (see below), whose sum is σ = 38431447200. Its totient is φ = 8540321592.

The previous prime is 21350803973. The next prime is 21350804017. The reversal of 21350803990 is 9930805312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067540190 + ... + 1067540209.

It is an arithmetic number, because the mean of its divisors is an integer number (4803930900).

Almost surely, 2^21350803990 is an apocalyptic number.

21350803990 is a deficient number, since it is larger than the sum of its proper divisors (17080643210).

21350803990 is a wasteful number, since it uses less digits than its factorization.

21350803990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135080406.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 21350803990 in words is "twenty-one billion, three hundred fifty million, eight hundred three thousand, nine hundred ninety".