21889901 has 8 divisors (see below), whose sum is σ = 24331104. Its totient is φ = 19523920.

The previous prime is 21889877. The next prime is 21889909. The reversal of 21889901 is 10998812.

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 21889901 - 2¹⁴ = 21873517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21889909) 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, 18191 + ... + 19356.

It is an arithmetic number, because the mean of its divisors is an integer number (3041388).

Almost surely, 2^21889901 is an apocalyptic number.

It is an amenable number.

21889901 is a deficient number, since it is larger than the sum of its proper divisors (2441203).

21889901 is a wasteful number, since it uses less digits than its factorization.

21889901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37611.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 21889901 is about 4678.6644461855. The cubic root of 21889901 is about 279.7357242835.

The spelling of 21889901 in words is "twenty-one million, eight hundred eighty-nine thousand, nine hundred one".