21010012099357 has 2 divisors, whose sum is σ = 21010012099358. Its totient is φ = 21010012099356.

The previous prime is 21010012099343. The next prime is 21010012099393. The reversal of 21010012099357 is 75399021001012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13543423059321 + 7466589040036 = 3680139^2 + 2732506^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010012099357 - 2³⁵ = 20975652360989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010012099757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505006049678 + 10505006049679.

It is an arithmetic number, because the mean of its divisors is an integer number (10505006049679).

Almost surely, 2^{21010012099357} is an apocalyptic number.

It is an amenable number.

21010012099357 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010012099357 is an equidigital number, since it uses as much as digits as its factorization.

21010012099357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 40.

The spelling of 21010012099357 in words is "twenty-one trillion, ten billion, twelve million, ninety-nine thousand, three hundred fifty-seven".