21490074 has 24 divisors (see below), whose sum is σ = 49301460. Its totient is φ = 6741888.

The previous prime is 21490043. The next prime is 21490093. The reversal of 21490074 is 47009412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15944049 + 5546025 = 3993^2 + 2355^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34809 + ... + 35420.

Almost surely, 2^21490074 is an apocalyptic number.

21490074 is an abundant number, since it is smaller than the sum of its proper divisors (27811386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21490074 is a wasteful number, since it uses less digits than its factorization.

21490074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70254 (or 70251 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21490074 is about 4635.7387760744. The cubic root of 21490074 is about 278.0220899239.

Adding to 21490074 its reverse (47009412), we get a palindrome (68499486).

The spelling of 21490074 in words is "twenty-one million, four hundred ninety thousand, seventy-four".