1984620760021 has 2 divisors, whose sum is σ = 1984620760022. Its totient is φ = 1984620760020.

The previous prime is 1984620759997. The next prime is 1984620760037. The reversal of 1984620760021 is 1200670264891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1665361859121 + 319258900900 = 1290489^2 + 565030^2 .

It is a cyclic number.

It is not a de Polignac number, because 1984620760021 - 2¹³ = 1984620751829 is a prime.

It is a super-2 number, since 2×1984620760021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1984620760051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992310380010 + 992310380011.

It is an arithmetic number, because the mean of its divisors is an integer number (992310380011).

Almost surely, 2^{1984620760021} is an apocalyptic number.

It is an amenable number.

1984620760021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984620760021 is an equidigital number, since it uses as much as digits as its factorization.

1984620760021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 1984620760021 in words is "one trillion, nine hundred eighty-four billion, six hundred twenty million, seven hundred sixty thousand, twenty-one".