21340490 has 32 divisors (see below), whose sum is σ = 39833424. Its totient is φ = 8225280.

The previous prime is 21340489. The next prime is 21340511. The reversal of 21340490 is 9404312.

It can be written as a sum of positive squares in 8 ways, for example, as 7360369 + 13980121 = 2713^2 + 3739^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50480 + ... + 50900.

Almost surely, 2^21340490 is an apocalyptic number.

21340490 is a deficient number, since it is larger than the sum of its proper divisors (18492934).

21340490 is a wasteful number, since it uses less digits than its factorization.

21340490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21340490 is about 4619.5768204458. The cubic root of 21340490 is about 277.3755197449.

The spelling of 21340490 in words is "twenty-one million, three hundred forty thousand, four hundred ninety".