21459074 has 32 divisors (see below), whose sum is σ = 39922176. Its totient is φ = 8424000.

The previous prime is 21459073. The next prime is 21459077. The reversal of 21459074 is 47095412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21459074.

It is not an unprimeable number, because it can be changed into a prime (21459073) 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, 28199 + ... + 28949.

It is an arithmetic number, because the mean of its divisors is an integer number (1247568).

Almost surely, 2^21459074 is an apocalyptic number.

21459074 is a deficient number, since it is larger than the sum of its proper divisors (18463102).

21459074 is a wasteful number, since it uses less digits than its factorization.

21459074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21459074 is about 4632.3939815175. The cubic root of 21459074 is about 277.8883408523. Note that the first 3 decimals are identical.

The spelling of 21459074 in words is "twenty-one million, four hundred fifty-nine thousand, seventy-four".