21586954 has 4 divisors (see below), whose sum is σ = 32380434. Its totient is φ = 10793476.

The previous prime is 21586937. The next prime is 21586963. The reversal of 21586954 is 45968512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18292729 + 3294225 = 4277^2 + 1815^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5396737 + ... + 5396740.

Almost surely, 2^21586954 is an apocalyptic number.

21586954 is a deficient number, since it is larger than the sum of its proper divisors (10793480).

21586954 is a wasteful number, since it uses less digits than its factorization.

21586954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10793479.

The product of its digits is 86400, while the sum is 40.

The square root of 21586954 is about 4646.1762773274. The cubic root of 21586954 is about 278.4392500508.

The spelling of 21586954 in words is "twenty-one million, five hundred eighty-six thousand, nine hundred fifty-four".