21210120299801 has 2 divisors, whose sum is σ = 21210120299802. Its totient is φ = 21210120299800.

The previous prime is 21210120299773. The next prime is 21210120299803. The reversal of 21210120299801 is 10899202101212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21065355269401 + 144765030400 = 4589701^2 + 380480^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210120299801 - 2⁶ = 21210120299737 is a prime.

Together with 21210120299803, 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 (21210120299803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605060149900 + 10605060149901.

It is an arithmetic number, because the mean of its divisors is an integer number (10605060149901).

Almost surely, 2^{21210120299801} is an apocalyptic number.

It is an amenable number.

21210120299801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210120299801 is an equidigital number, since it uses as much as digits as its factorization.

21210120299801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 21210120299801 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, two hundred ninety-nine thousand, eight hundred one".