21230874901 has 2 divisors, whose sum is σ = 21230874902. Its totient is φ = 21230874900.

The previous prime is 21230874853. The next prime is 21230874967. The reversal of 21230874901 is 10947803212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16071900625 + 5158974276 = 126775^2 + 71826^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230874901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230874001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615437450 + 10615437451.

It is an arithmetic number, because the mean of its divisors is an integer number (10615437451).

Almost surely, 2^21230874901 is an apocalyptic number.

It is an amenable number.

21230874901 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230874901 is an equidigital number, since it uses as much as digits as its factorization.

21230874901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 21230874901 in words is "twenty-one billion, two hundred thirty million, eight hundred seventy-four thousand, nine hundred one".