21210954 has 32 divisors (see below), whose sum is σ = 45703680. Its totient is φ = 6540912.

The previous prime is 21210949. The next prime is 21210961. The reversal of 21210954 is 45901212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2739 + ... + 7065.

It is an arithmetic number, because the mean of its divisors is an integer number (1428240).

Almost surely, 2^21210954 is an apocalyptic number.

21210954 is an abundant number, since it is smaller than the sum of its proper divisors (24492726).

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

21210954 is a wasteful number, since it uses less digits than its factorization.

21210954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4394.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 21210954 is about 4605.5351480583. The cubic root of 21210954 is about 276.8131605919.

The spelling of 21210954 in words is "twenty-one million, two hundred ten thousand, nine hundred fifty-four".