21954774 has 16 divisors (see below), whose sum is σ = 44345520. Its totient is φ = 7245600.

The previous prime is 21954767. The next prime is 21954799. The reversal of 21954774 is 47745912.

It is a congruent 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, 17509 + ... + 18720.

It is an arithmetic number, because the mean of its divisors is an integer number (2771595).

Almost surely, 2^21954774 is an apocalyptic number.

21954774 is an abundant number, since it is smaller than the sum of its proper divisors (22390746).

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

21954774 is a wasteful number, since it uses less digits than its factorization.

21954774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36335.

The product of its digits is 70560, while the sum is 39.

The square root of 21954774 is about 4685.5921717537. The cubic root of 21954774 is about 280.0117937209.

The spelling of 21954774 in words is "twenty-one million, nine hundred fifty-four thousand, seven hundred seventy-four".