2021910722729 has 2 divisors, whose sum is σ = 2021910722730. Its totient is φ = 2021910722728.

The previous prime is 2021910722701. The next prime is 2021910722857. The reversal of 2021910722729 is 9272270191202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1343923162729 + 677987560000 = 1159277^2 + 823400^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021910722729 - 2²⁰ = 2021909674153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021910722729.

It is not a weakly prime, because it can be changed into another prime (2021910722129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010955361364 + 1010955361365.

It is an arithmetic number, because the mean of its divisors is an integer number (1010955361365).

Almost surely, 2^{2021910722729} is an apocalyptic number.

It is an amenable number.

2021910722729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021910722729 is an equidigital number, since it uses as much as digits as its factorization.

2021910722729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 2021910722729 in words is "two trillion, twenty-one billion, nine hundred ten million, seven hundred twenty-two thousand, seven hundred twenty-nine".