21330601650461 has 2 divisors, whose sum is σ = 21330601650462. Its totient is φ = 21330601650460.

The previous prime is 21330601650437. The next prime is 21330601650487. The reversal of 21330601650461 is 16405610603312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10887815509561 + 10442786140900 = 3299669^2 + 3231530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330601650461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330601650661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665300825230 + 10665300825231.

It is an arithmetic number, because the mean of its divisors is an integer number (10665300825231).

Almost surely, 2^{21330601650461} is an apocalyptic number.

It is an amenable number.

21330601650461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330601650461 is an equidigital number, since it uses as much as digits as its factorization.

21330601650461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 21330601650461 in words is "twenty-one trillion, three hundred thirty billion, six hundred one million, six hundred fifty thousand, four hundred sixty-one".