21165243651354 has 16 divisors (see below), whose sum is σ = 46178713421280. Its totient is φ = 6413710197360.

The previous prime is 21165243651323. The next prime is 21165243651379. The reversal of 21165243651354 is 45315634256112.

It is a happy number.

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, 160342754869 + ... + 160342755000.

It is an arithmetic number, because the mean of its divisors is an integer number (2886169588830).

Almost surely, 2^{21165243651354} is an apocalyptic number.

21165243651354 is an abundant number, since it is smaller than the sum of its proper divisors (25013469769926).

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

21165243651354 is a wasteful number, since it uses less digits than its factorization.

21165243651354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320685509885.

The product of its digits is 2592000, while the sum is 48.

The spelling of 21165243651354 in words is "twenty-one trillion, one hundred sixty-five billion, two hundred forty-three million, six hundred fifty-one thousand, three hundred fifty-four".