21858954 has 16 divisors (see below), whose sum is σ = 47080992. Its totient is φ = 6725808.

The previous prime is 21858931. The next prime is 21858979. The reversal of 21858954 is 45985812.

It is a happy number.

It is a super-3 number, since 3×21858954³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140044 + ... + 140199.

It is an arithmetic number, because the mean of its divisors is an integer number (2942562).

Almost surely, 2^21858954 is an apocalyptic number.

21858954 is an abundant number, since it is smaller than the sum of its proper divisors (25222038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21858954 is a wasteful number, since it uses less digits than its factorization.

21858954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280261.

The product of its digits is 115200, while the sum is 42.

The square root of 21858954 is about 4675.3560292239. The cubic root of 21858954 is about 279.6038360017.

The spelling of 21858954 in words is "twenty-one million, eight hundred fifty-eight thousand, nine hundred fifty-four".