21100230953 has 2 divisors, whose sum is σ = 21100230954. Its totient is φ = 21100230952.

The previous prime is 21100230919. The next prime is 21100230967. The reversal of 21100230953 is 35903200112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11094830224 + 10005400729 = 105332^2 + 100027^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100230953 - 2¹² = 21100226857 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100230913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550115476 + 10550115477.

It is an arithmetic number, because the mean of its divisors is an integer number (10550115477).

Almost surely, 2^21100230953 is an apocalyptic number.

It is an amenable number.

21100230953 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100230953 is an equidigital number, since it uses as much as digits as its factorization.

21100230953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The spelling of 21100230953 in words is "twenty-one billion, one hundred million, two hundred thirty thousand, nine hundred fifty-three".