901220101011221 has 2 divisors, whose sum is σ = 901220101011222. Its totient is φ = 901220101011220.

The previous prime is 901220101011193. The next prime is 901220101011299. The reversal of 901220101011221 is 122110101022109.

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., 739564489654225 + 161655611356996 = 27194935^2 + 12714386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-901220101011221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (901220101011521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450610050505610 + 450610050505611.

It is an arithmetic number, because the mean of its divisors is an integer number (450610050505611).

Almost surely, 2^{901220101011221} is an apocalyptic number.

It is an amenable number.

901220101011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

901220101011221 is an equidigital number, since it uses as much as digits as its factorization.

901220101011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 901220101011221 in words is "nine hundred one trillion, two hundred twenty billion, one hundred one million, eleven thousand, two hundred twenty-one".