21201945093337 has 2 divisors, whose sum is σ = 21201945093338. Its totient is φ = 21201945093336.

The previous prime is 21201945093317. The next prime is 21201945093341. The reversal of 21201945093337 is 73339054910212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11148092943376 + 10053852149961 = 3338876^2 + 3170781^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201945093337 - 2¹⁹ = 21201944569049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201945093317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600972546668 + 10600972546669.

It is an arithmetic number, because the mean of its divisors is an integer number (10600972546669).

Almost surely, 2^{21201945093337} is an apocalyptic number.

It is an amenable number.

21201945093337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201945093337 is an equidigital number, since it uses as much as digits as its factorization.

21201945093337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 49.

The spelling of 21201945093337 in words is "twenty-one trillion, two hundred one billion, nine hundred forty-five million, ninety-three thousand, three hundred thirty-seven".