21056954 has 8 divisors (see below), whose sum is σ = 31911348. Its totient is φ = 10419840.

The previous prime is 21056951. The next prime is 21056963. The reversal of 21056954 is 45965012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20205025 + 851929 = 4495^2 + 923^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21056954.

It is not an unprimeable number, because it can be changed into a prime (21056951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54077 + ... + 54464.

Almost surely, 2^21056954 is an apocalyptic number.

21056954 is a deficient number, since it is larger than the sum of its proper divisors (10854394).

21056954 is a wasteful number, since it uses less digits than its factorization.

21056954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108640.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 21056954 is about 4588.7856781506. The cubic root of 21056954 is about 276.1416080017.

The spelling of 21056954 in words is "twenty-one million, fifty-six thousand, nine hundred fifty-four".