921442495397 has 2 divisors, whose sum is σ = 921442495398. Its totient is φ = 921442495396.

The previous prime is 921442495361. The next prime is 921442495403. The reversal of 921442495397 is 793594244129.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 483524138881 + 437918356516 = 695359^2 + 661754^2 .

It is a cyclic number.

It is not a de Polignac number, because 921442495397 - 2⁶ = 921442495333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921442495357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460721247698 + 460721247699.

It is an arithmetic number, because the mean of its divisors is an integer number (460721247699).

Almost surely, 2^921442495397 is an apocalyptic number.

It is an amenable number.

921442495397 is a deficient number, since it is larger than the sum of its proper divisors (1).

921442495397 is an equidigital number, since it uses as much as digits as its factorization.

921442495397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 59.

The spelling of 921442495397 in words is "nine hundred twenty-one billion, four hundred forty-two million, four hundred ninety-five thousand, three hundred ninety-seven".