21294051 has 16 divisors (see below), whose sum is σ = 28939680. Its totient is φ = 13925120.

The previous prime is 21294029. The next prime is 21294089. The reversal of 21294051 is 15049212.

It is a cyclic number.

It is not a de Polignac number, because 21294051 - 2¹⁴ = 21277667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21294001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45961 + ... + 46421.

It is an arithmetic number, because the mean of its divisors is an integer number (1808730).

Almost surely, 2^21294051 is an apocalyptic number.

21294051 is a deficient number, since it is larger than the sum of its proper divisors (7645629).

21294051 is a wasteful number, since it uses less digits than its factorization.

21294051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 21294051 is about 4614.5477568230. The cubic root of 21294051 is about 277.1741748438.

The spelling of 21294051 in words is "twenty-one million, two hundred ninety-four thousand, fifty-one".