21234215773699 has 4 divisors (see below), whose sum is σ = 21237948283480. Its totient is φ = 21230483263920.

The previous prime is 21234215773697. The next prime is 21234215773703. The reversal of 21234215773699 is 99637751243212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21234215773699 - 2¹ = 21234215773697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234215773697) 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, 1866246357 + ... + 1866257734.

It is an arithmetic number, because the mean of its divisors is an integer number (5309487070870).

Almost surely, 2^{21234215773699} is an apocalyptic number.

21234215773699 is a deficient number, since it is larger than the sum of its proper divisors (3732509781).

21234215773699 is an equidigital number, since it uses as much as digits as its factorization.

21234215773699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3732509780.

The product of its digits is 34292160, while the sum is 61.

The spelling of 21234215773699 in words is "twenty-one trillion, two hundred thirty-four billion, two hundred fifteen million, seven hundred seventy-three thousand, six hundred ninety-nine".