21990153179 has 8 divisors (see below), whose sum is σ = 22273069728. Its totient is φ = 21709010880.

The previous prime is 21990153169. The next prime is 21990153217. The reversal of 21990153179 is 97135109912.

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

It is a cyclic number.

It is not a de Polignac number, because 21990153179 - 2⁸ = 21990152923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21990153169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418607 + ... + 468200.

It is an arithmetic number, because the mean of its divisors is an integer number (2784133716).

Almost surely, 2^21990153179 is an apocalyptic number.

21990153179 is a deficient number, since it is larger than the sum of its proper divisors (282916549).

21990153179 is a wasteful number, since it uses less digits than its factorization.

21990153179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887125.

The product of its (nonzero) digits is 153090, while the sum is 47.

The spelling of 21990153179 in words is "twenty-one billion, nine hundred ninety million, one hundred fifty-three thousand, one hundred seventy-nine".