21674400490 has 8 divisors (see below), whose sum is σ = 39013920900. Its totient is φ = 8669760192.

The previous prime is 21674400481. The next prime is 21674400493. The reversal of 21674400490 is 9400447612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21467817361 + 206583129 = 146519^2 + 14373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21674400493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1083720015 + ... + 1083720034.

Almost surely, 2^21674400490 is an apocalyptic number.

21674400490 is a deficient number, since it is larger than the sum of its proper divisors (17339520410).

21674400490 is a wasteful number, since it uses less digits than its factorization.

21674400490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167440056.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 21674400490 in words is "twenty-one billion, six hundred seventy-four million, four hundred thousand, four hundred ninety".