21294610 has 32 divisors (see below), whose sum is σ = 40000320. Its totient is φ = 8154432.

The previous prime is 21294587. The next prime is 21294617. The reversal of 21294610 is 1649212.

It is not an unprimeable number, because it can be changed into a prime (21294617) 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 15 ways as a sum of consecutive naturals, for example, 24361 + ... + 25219.

It is an arithmetic number, because the mean of its divisors is an integer number (1250010).

Almost surely, 2^21294610 is an apocalyptic number.

21294610 is a deficient number, since it is larger than the sum of its proper divisors (18705710).

21294610 is a wasteful number, since it uses less digits than its factorization.

21294610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970.

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

The square root of 21294610 is about 4614.6083257412. The cubic root of 21294610 is about 277.1766002318.

It can be divided in two parts, 21294 and 610, that added together give a square (21904 = 148²).

The spelling of 21294610 in words is "twenty-one million, two hundred ninety-four thousand, six hundred ten".