21929001 has 8 divisors (see below), whose sum is σ = 29260320. Its totient is φ = 14608512.

The previous prime is 21928987. The next prime is 21929003. The reversal of 21929001 is 10092912.

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

It is not a de Polignac number, because 21929001 - 2⁵ = 21928969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21929003) 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, 6370 + ... + 9188.

It is an arithmetic number, because the mean of its divisors is an integer number (3657540).

Almost surely, 2^21929001 is an apocalyptic number.

It is an amenable number.

21929001 is a deficient number, since it is larger than the sum of its proper divisors (7331319).

21929001 is a wasteful number, since it uses less digits than its factorization.

21929001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 21929001 is about 4682.8411247874. The cubic root of 21929001 is about 279.9021809666.

The spelling of 21929001 in words is "twenty-one million, nine hundred twenty-nine thousand, one".