21438904241674 has 16 divisors (see below), whose sum is σ = 32443453377288. Its totient is φ = 10624422764032.

The previous prime is 21438904241597. The next prime is 21438904241687. The reversal of 21438904241674 is 47614240983412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 219918792025 + 21218985449649 = 468955^2 + 4606407^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14343444 + ... + 15767440.

Almost surely, 2^{21438904241674} is an apocalyptic number.

21438904241674 is a deficient number, since it is larger than the sum of its proper divisors (11004549135614).

21438904241674 is a wasteful number, since it uses less digits than its factorization.

21438904241674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490729.

The product of its (nonzero) digits is 9289728, while the sum is 55.

The spelling of 21438904241674 in words is "twenty-one trillion, four hundred thirty-eight billion, nine hundred four million, two hundred forty-one thousand, six hundred seventy-four".