21061294 has 4 divisors (see below), whose sum is σ = 31591944. Its totient is φ = 10530646.

The previous prime is 21061259. The next prime is 21061309. The reversal of 21061294 is 49216012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5265322 + ... + 5265325.

It is an arithmetic number, because the mean of its divisors is an integer number (7897986).

Almost surely, 2^21061294 is an apocalyptic number.

21061294 is a deficient number, since it is larger than the sum of its proper divisors (10530650).

21061294 is a wasteful number, since it uses less digits than its factorization.

21061294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10530649.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21061294 is about 4589.2585457784. The cubic root of 21061294 is about 276.1605783342.

It can be divided in two parts, 210 and 61294, that added together give a square (61504 = 248²).

The spelling of 21061294 in words is "twenty-one million, sixty-one thousand, two hundred ninety-four".