21365265352445 has 16 divisors (see below), whose sum is σ = 29306237023488. Its totient is φ = 14647816828800.

The previous prime is 21365265352439. The next prime is 21365265352511. The reversal of 21365265352445 is 54425356256312.

It is not a de Polignac number, because 21365265352445 - 2⁶ = 21365265352381 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 55029656 + ... + 55416545.

It is an arithmetic number, because the mean of its divisors is an integer number (1831639813968).

Almost surely, 2^{21365265352445} is an apocalyptic number.

It is an amenable number.

21365265352445 is a deficient number, since it is larger than the sum of its proper divisors (7940971671043).

21365265352445 is a wasteful number, since it uses less digits than its factorization.

21365265352445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110451740.

The product of its digits is 25920000, while the sum is 53.

The spelling of 21365265352445 in words is "twenty-one trillion, three hundred sixty-five billion, two hundred sixty-five million, three hundred fifty-two thousand, four hundred forty-five".