1022721154421 has 2 divisors, whose sum is σ = 1022721154422. Its totient is φ = 1022721154420.

The previous prime is 1022721154393. The next prime is 1022721154451. The reversal of 1022721154421 is 1244511272201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 747005847025 + 275715307396 = 864295^2 + 525086^2 .

It is an emirp because it is prime and its reverse (1244511272201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1022721154421 - 2¹⁴ = 1022721138037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022721154451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511360577210 + 511360577211.

It is an arithmetic number, because the mean of its divisors is an integer number (511360577211).

Almost surely, 2^{1022721154421} is an apocalyptic number.

It is an amenable number.

1022721154421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022721154421 is an equidigital number, since it uses as much as digits as its factorization.

1022721154421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 32.

The spelling of 1022721154421 in words is "one trillion, twenty-two billion, seven hundred twenty-one million, one hundred fifty-four thousand, four hundred twenty-one".