21164154 has 16 divisors (see below), whose sum is σ = 46176480. Its totient is φ = 6413360.

The previous prime is 21164141. The next prime is 21164183. The reversal of 21164154 is 45146112.

It is a happy number.

It is a super-3 number, since 3×21164154³ (a number of 23 digits) contains 333 as substring.

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, 160269 + ... + 160400.

It is an arithmetic number, because the mean of its divisors is an integer number (2886030).

Almost surely, 2^21164154 is an apocalyptic number.

21164154 is an abundant number, since it is smaller than the sum of its proper divisors (25012326).

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

21164154 is a wasteful number, since it uses less digits than its factorization.

21164154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320685.

The product of its digits is 960, while the sum is 24.

The square root of 21164154 is about 4600.4514995813. The cubic root of 21164154 is about 276.6094231660.

The spelling of 21164154 in words is "twenty-one million, one hundred sixty-four thousand, one hundred fifty-four".