21227753213 has 4 divisors (see below), whose sum is σ = 21259295868. Its totient is φ = 21196210560.

The previous prime is 21227753149. The next prime is 21227753243. The reversal of 21227753213 is 31235772212.

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 8812891129 + 12414862084 = 93877^2 + 111422^2 .

It is a cyclic number.

It is not a de Polignac number, because 21227753213 - 2⁶ = 21227753149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227753243) 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, 15770318 + ... + 15771663.

It is an arithmetic number, because the mean of its divisors is an integer number (5314823967).

Almost surely, 2^21227753213 is an apocalyptic number.

It is an amenable number.

21227753213 is a deficient number, since it is larger than the sum of its proper divisors (31542655).

21227753213 is an equidigital number, since it uses as much as digits as its factorization.

21227753213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31542654.

The product of its digits is 35280, while the sum is 35.

The spelling of 21227753213 in words is "twenty-one billion, two hundred twenty-seven million, seven hundred fifty-three thousand, two hundred thirteen".