21294156 has 24 divisors (see below), whose sum is σ = 53508784. Its totient is φ = 6552000.

The previous prime is 21294151. The next prime is 21294187. The reversal of 21294156 is 65149212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294151) 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, 68095 + ... + 68406.

Almost surely, 2^21294156 is an apocalyptic number.

21294156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21294156 is an abundant number, since it is smaller than the sum of its proper divisors (32214628).

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

21294156 is a wasteful number, since it uses less digits than its factorization.

21294156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136521 (or 136519 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 21294156 is about 4614.5591338718. The cubic root of 21294156 is about 277.1746304208.

The spelling of 21294156 in words is "twenty-one million, two hundred ninety-four thousand, one hundred fifty-six".