21950573123 has 2 divisors, whose sum is σ = 21950573124. Its totient is φ = 21950573122.

The previous prime is 21950573119. The next prime is 21950573129. The reversal of 21950573123 is 32137505912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21950573123 - 2² = 21950573119 is a prime.

It is not a weakly prime, because it can be changed into another prime (21950573129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10975286561 + 10975286562.

It is an arithmetic number, because the mean of its divisors is an integer number (10975286562).

Almost surely, 2^21950573123 is an apocalyptic number.

21950573123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21950573123 is an equidigital number, since it uses as much as digits as its factorization.

21950573123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 38.

The spelling of 21950573123 in words is "twenty-one billion, nine hundred fifty million, five hundred seventy-three thousand, one hundred twenty-three".