1220102921 has 2 divisors, whose sum is σ = 1220102922. Its totient is φ = 1220102920.

The previous prime is 1220102899. The next prime is 1220102959. The reversal of 1220102921 is 1292010221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724417225 + 495685696 = 26915^2 + 22264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220102921 - 2¹⁴ = 1220086537 is a prime.

It is a super-2 number, since 2×1220102921² = 2977302275665464482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220102893 and 1220102902.

It is not a weakly prime, because it can be changed into another prime (1220101921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610051460 + 610051461.

It is an arithmetic number, because the mean of its divisors is an integer number (610051461).

Almost surely, 2^1220102921 is an apocalyptic number.

It is an amenable number.

1220102921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220102921 is an equidigital number, since it uses as much as digits as its factorization.

1220102921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1220102921 is about 34929.9716719038. The cubic root of 1220102921 is about 1068.5597768855.

The spelling of 1220102921 in words is "one billion, two hundred twenty million, one hundred two thousand, nine hundred twenty-one".