21166854 has 32 divisors (see below), whose sum is σ = 44492544. Its totient is φ = 6700320.

The previous prime is 21166837. The next prime is 21166867. The reversal of 21166854 is 45866112.

It is a congruent number.

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, 22024 + ... + 22964.

It is an arithmetic number, because the mean of its divisors is an integer number (1390392).

Almost surely, 2^21166854 is an apocalyptic number.

21166854 is an abundant number, since it is smaller than the sum of its proper divisors (23325690).

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

21166854 is a wasteful number, since it uses less digits than its factorization.

21166854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132.

The product of its digits is 11520, while the sum is 33.

The square root of 21166854 is about 4600.7449396810. The cubic root of 21166854 is about 276.6211854077.

The spelling of 21166854 in words is "twenty-one million, one hundred sixty-six thousand, eight hundred fifty-four".