21045954 has 16 divisors (see below), whose sum is σ = 42154848. Its totient is φ = 7004832.

The previous prime is 21045917. The next prime is 21045961. The reversal of 21045954 is 45954012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2494 + ... + 6950.

It is an arithmetic number, because the mean of its divisors is an integer number (2634678).

Almost surely, 2^21045954 is an apocalyptic number.

21045954 is an abundant number, since it is smaller than the sum of its proper divisors (21108894).

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

21045954 is a wasteful number, since it uses less digits than its factorization.

21045954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5249.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 21045954 is about 4587.5869474049. The cubic root of 21045954 is about 276.0935148354.

Adding to 21045954 its reverse (45954012), we get a palindrome (66999966).

It can be divided in two parts, 210 and 45954, that added together give a palindrome (46164).

The spelling of 21045954 in words is "twenty-one million, forty-five thousand, nine hundred fifty-four".