21240954 has 40 divisors (see below), whose sum is σ = 54397728. Its totient is φ = 6068520.

The previous prime is 21240913. The next prime is 21240971. The reversal of 21240954 is 45904212.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 19 ways as a sum of consecutive naturals, for example, 8232 + ... + 10499.

Almost surely, 2^21240954 is an apocalyptic number.

21240954 is an abundant number, since it is smaller than the sum of its proper divisors (33156774).

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

21240954 is a wasteful number, since it uses less digits than its factorization.

21240954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18752 (or 18743 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21240954 is about 4608.7909477432. The cubic root of 21240954 is about 276.9436039271.

The spelling of 21240954 in words is "twenty-one million, two hundred forty thousand, nine hundred fifty-four".