21046236245 has 4 divisors (see below), whose sum is σ = 25255483500. Its totient is φ = 16836988992.

The previous prime is 21046236223. The next prime is 21046236259. The reversal of 21046236245 is 54263264012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11534330404 + 9511905841 = 107398^2 + 97529^2 .

It is a cyclic number.

It is not a de Polignac number, because 21046236245 - 2³⁴ = 3866367061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104623620 + ... + 2104623629.

It is an arithmetic number, because the mean of its divisors is an integer number (6313870875).

Almost surely, 2^21046236245 is an apocalyptic number.

It is an amenable number.

21046236245 is a deficient number, since it is larger than the sum of its proper divisors (4209247255).

21046236245 is an equidigital number, since it uses as much as digits as its factorization.

21046236245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4209247254.

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 21046236245 in words is "twenty-one billion, forty-six million, two hundred thirty-six thousand, two hundred forty-five".