21890654 has 8 divisors (see below), whose sum is σ = 32867208. Its totient is φ = 10934920.

The previous prime is 21890651. The next prime is 21890677. The reversal of 21890654 is 45609812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21890651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2237 + ... + 6984.

It is an arithmetic number, because the mean of its divisors is an integer number (4108401).

Almost surely, 2^21890654 is an apocalyptic number.

21890654 is a deficient number, since it is larger than the sum of its proper divisors (10976554).

21890654 is a wasteful number, since it uses less digits than its factorization.

21890654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10410.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21890654 is about 4678.7449171760. The cubic root of 21890654 is about 279.7389318293.

The spelling of 21890654 in words is "twenty-one million, eight hundred ninety thousand, six hundred fifty-four".