21606954 has 16 divisors (see below), whose sum is σ = 43480992. Its totient is φ = 7157808.

The previous prime is 21606953. The next prime is 21606973. The reversal of 21606954 is 45960612.

It is a super-2 number, since 2×21606954² = 933720922316232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21606953) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10069 + ... + 12024.

It is an arithmetic number, because the mean of its divisors is an integer number (2717562).

Almost surely, 2^21606954 is an apocalyptic number.

21606954 is an abundant number, since it is smaller than the sum of its proper divisors (21874038).

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

21606954 is a wasteful number, since it uses less digits than its factorization.

21606954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22261.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 21606954 is about 4648.3280865275. The cubic root of 21606954 is about 278.5252134848.

The spelling of 21606954 in words is "twenty-one million, six hundred six thousand, nine hundred fifty-four".