21642146410 has 16 divisors (see below), whose sum is σ = 38969550216. Its totient is φ = 8653817088.

The previous prime is 21642146387. The next prime is 21642146417. The reversal of 21642146410 is 1464124612.

It can be written as a sum of positive squares in 4 ways, for example, as 15491038369 + 6151108041 = 124463^2 + 78429^2 .

It is not an unprimeable number, because it can be changed into a prime (21642146417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350187 + ... + 407326.

Almost surely, 2^21642146410 is an apocalyptic number.

21642146410 is a deficient number, since it is larger than the sum of its proper divisors (17327403806).

21642146410 is a wasteful number, since it uses less digits than its factorization.

21642146410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760377.

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 21642146410 in words is "twenty-one billion, six hundred forty-two million, one hundred forty-six thousand, four hundred ten".