21231650311 has 2 divisors, whose sum is σ = 21231650312. Its totient is φ = 21231650310.

The previous prime is 21231650291. The next prime is 21231650329. The reversal of 21231650311 is 11305613212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21231650311 - 2²⁵ = 21198095879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231657311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615825155 + 10615825156.

It is an arithmetic number, because the mean of its divisors is an integer number (10615825156).

Almost surely, 2^21231650311 is an apocalyptic number.

21231650311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231650311 is an equidigital number, since it uses as much as digits as its factorization.

21231650311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The spelling of 21231650311 in words is "twenty-one billion, two hundred thirty-one million, six hundred fifty thousand, three hundred eleven".