21901215190 has 8 divisors (see below), whose sum is σ = 39422187360. Its totient is φ = 8760486072.

The previous prime is 21901215179. The next prime is 21901215223. The reversal of 21901215190 is 9151210912.

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

It is a super-2 number, since 2×21901215190² (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 in 3 ways as a sum of consecutive naturals, for example, 1095060750 + ... + 1095060769.

It is an arithmetic number, because the mean of its divisors is an integer number (4927773420).

Almost surely, 2^21901215190 is an apocalyptic number.

21901215190 is a deficient number, since it is larger than the sum of its proper divisors (17520972170).

21901215190 is a wasteful number, since it uses less digits than its factorization.

21901215190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190121526.

The product of its (nonzero) digits is 1620, while the sum is 31.

The spelling of 21901215190 in words is "twenty-one billion, nine hundred one million, two hundred fifteen thousand, one hundred ninety".