901201421 has 2 divisors, whose sum is σ = 901201422. Its totient is φ = 901201420.

The previous prime is 901201397. The next prime is 901201423. The reversal of 901201421 is 124102109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 750157321 + 151044100 = 27389^2 + 12290^2 .

It is an emirp because it is prime and its reverse (124102109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 901201421 - 2²² = 897007117 is a prime.

Together with 901201423, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 901201393 and 901201402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (901201423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450600710 + 450600711.

It is an arithmetic number, because the mean of its divisors is an integer number (450600711).

Almost surely, 2^901201421 is an apocalyptic number.

It is an amenable number.

901201421 is a deficient number, since it is larger than the sum of its proper divisors (1).

901201421 is an equidigital number, since it uses as much as digits as its factorization.

901201421 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 20.

The square root of 901201421 is about 30020.0170053250. The cubic root of 901201421 is about 965.9188081080.

The spelling of 901201421 in words is "nine hundred one million, two hundred one thousand, four hundred twenty-one".