21953911159 has 2 divisors, whose sum is σ = 21953911160. Its totient is φ = 21953911158.

The previous prime is 21953911141. The next prime is 21953911181. The reversal of 21953911159 is 95111935912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21953911159 - 2²¹ = 21951814007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21953941159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10976955579 + 10976955580.

It is an arithmetic number, because the mean of its divisors is an integer number (10976955580).

Almost surely, 2^21953911159 is an apocalyptic number.

21953911159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21953911159 is an equidigital number, since it uses as much as digits as its factorization.

21953911159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109350, while the sum is 46.

The spelling of 21953911159 in words is "twenty-one billion, nine hundred fifty-three million, nine hundred eleven thousand, one hundred fifty-nine".