921246121 has 2 divisors, whose sum is σ = 921246122. Its totient is φ = 921246120.

The previous prime is 921246113. The next prime is 921246143. The reversal of 921246121 is 121642129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 567392400 + 353853721 = 23820^2 + 18811^2 .

It is a cyclic number.

It is not a de Polignac number, because 921246121 - 2³ = 921246113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 921246121.

It is not a weakly prime, because it can be changed into another prime (921246101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460623060 + 460623061.

It is an arithmetic number, because the mean of its divisors is an integer number (460623061).

Almost surely, 2^921246121 is an apocalyptic number.

It is an amenable number.

921246121 is a deficient number, since it is larger than the sum of its proper divisors (1).

921246121 is an equidigital number, since it uses as much as digits as its factorization.

921246121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 921246121 is about 30352.0365214593. The cubic root of 921246121 is about 973.0277452692.

The spelling of 921246121 in words is "nine hundred twenty-one million, two hundred forty-six thousand, one hundred twenty-one".