1220101901 has 2 divisors, whose sum is σ = 1220101902. Its totient is φ = 1220101900.

The previous prime is 1220101879. The next prime is 1220101913. The reversal of 1220101901 is 1091010221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190181001 + 29920900 = 34499^2 + 5470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220101901 - 2¹⁸ = 1219839757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220101901.

It is a congruent number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610050950 + 610050951.

It is an arithmetic number, because the mean of its divisors is an integer number (610050951).

Almost surely, 2^1220101901 is an apocalyptic number.

It is an amenable number.

1220101901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220101901 is an equidigital number, since it uses as much as digits as its factorization.

1220101901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1220101901 is about 34929.9570712590. The cubic root of 1220101901 is about 1068.5594791152.

The spelling of 1220101901 in words is "one billion, two hundred twenty million, one hundred one thousand, nine hundred one".