21486674 has 32 divisors (see below), whose sum is σ = 37786176. Its totient is φ = 9054720.

The previous prime is 21486671. The next prime is 21486697. The reversal of 21486674 is 47668412.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21486671) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 26909 + ... + 27695.

It is an arithmetic number, because the mean of its divisors is an integer number (1180818).

Almost surely, 2^21486674 is an apocalyptic number.

21486674 is a deficient number, since it is larger than the sum of its proper divisors (16299502).

21486674 is a wasteful number, since it uses less digits than its factorization.

21486674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

The product of its digits is 64512, while the sum is 38.

The square root of 21486674 is about 4635.3720454781. The cubic root of 21486674 is about 278.0074269534.

The spelling of 21486674 in words is "twenty-one million, four hundred eighty-six thousand, six hundred seventy-four".