21145292 has 24 divisors (see below), whose sum is σ = 43750560. Its totient is φ = 8749440.

The previous prime is 21145261. The next prime is 21145301. The reversal of 21145292 is 29254112.

It is an unprimeable number.

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, 12209 + ... + 13832.

It is an arithmetic number, because the mean of its divisors is an integer number (1822940).

Almost surely, 2^21145292 is an apocalyptic number.

It is an amenable number.

21145292 is an abundant number, since it is smaller than the sum of its proper divisors (22605268).

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

21145292 is a wasteful number, since it uses less digits than its factorization.

21145292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26081 (or 26079 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 21145292 is about 4598.4010264439. The cubic root of 21145292 is about 276.5272250987.

The spelling of 21145292 in words is "twenty-one million, one hundred forty-five thousand, two hundred ninety-two".