121362821 has 2 divisors, whose sum is σ = 121362822. Its totient is φ = 121362820.

The previous prime is 121362817. The next prime is 121362859. The reversal of 121362821 is 128263121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72012196 + 49350625 = 8486^2 + 7025^2 .

It is a cyclic number.

It is not a de Polignac number, because 121362821 - 2² = 121362817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121362121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60681410 + 60681411.

It is an arithmetic number, because the mean of its divisors is an integer number (60681411).

Almost surely, 2^121362821 is an apocalyptic number.

It is an amenable number.

121362821 is a deficient number, since it is larger than the sum of its proper divisors (1).

121362821 is an equidigital number, since it uses as much as digits as its factorization.

121362821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 121362821 is about 11016.4795193383. The cubic root of 121362821 is about 495.1026158716.

The spelling of 121362821 in words is "one hundred twenty-one million, three hundred sixty-two thousand, eight hundred twenty-one".