21172294 has 32 divisors (see below), whose sum is σ = 37608480. Its totient is φ = 8812800.

The previous prime is 21172273. The next prime is 21172309. The reversal of 21172294 is 49227112.

21172294 = 248² + 249² + ... + 428².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51562 + ... + 51970.

It is an arithmetic number, because the mean of its divisors is an integer number (1175265).

Almost surely, 2^21172294 is an apocalyptic number.

21172294 is a deficient number, since it is larger than the sum of its proper divisors (16436186).

21172294 is a wasteful number, since it uses less digits than its factorization.

21172294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616.

The product of its digits is 2016, while the sum is 28.

The square root of 21172294 is about 4601.3361103054. The cubic root of 21172294 is about 276.6448811091.

The spelling of 21172294 in words is "twenty-one million, one hundred seventy-two thousand, two hundred ninety-four".