10291211921 has 2 divisors, whose sum is σ = 10291211922. Its totient is φ = 10291211920.

The previous prime is 10291211911. The next prime is 10291211923. The reversal of 10291211921 is 12911219201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10268782225 + 22429696 = 101335^2 + 4736^2 .

It is a cyclic number.

It is not a de Polignac number, because 10291211921 - 2²² = 10287017617 is a prime.

Together with 10291211923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10291211923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5145605960 + 5145605961.

It is an arithmetic number, because the mean of its divisors is an integer number (5145605961).

Almost surely, 2^10291211921 is an apocalyptic number.

It is an amenable number.

10291211921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10291211921 is an equidigital number, since it uses as much as digits as its factorization.

10291211921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 10291211921 in words is "ten billion, two hundred ninety-one million, two hundred eleven thousand, nine hundred twenty-one".