21984901 has 8 divisors (see below), whose sum is σ = 22224384. Its totient is φ = 21747120.

The previous prime is 21984889. The next prime is 21984913. The reversal of 21984901 is 10948912.

It is an interprime number because it is at equal distance from previous prime (21984889) and next prime (21984913).

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 21984901 - 2²³ = 13596293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21984701) 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, 69195 + ... + 69511.

It is an arithmetic number, because the mean of its divisors is an integer number (2778048).

Almost surely, 2^21984901 is an apocalyptic number.

It is an amenable number.

21984901 is a deficient number, since it is larger than the sum of its proper divisors (239483).

21984901 is a wasteful number, since it uses less digits than its factorization.

21984901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 21984901 is about 4688.8059247531. The cubic root of 21984901 is about 280.1398153770.

The spelling of 21984901 in words is "twenty-one million, nine hundred eighty-four thousand, nine hundred one".