2221213901 has 2 divisors, whose sum is σ = 2221213902. Its totient is φ = 2221213900.

The previous prime is 2221213889. The next prime is 2221213903. The reversal of 2221213901 is 1093121222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2220859876 + 354025 = 47126^2 + 595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221213901 is a prime.

Together with 2221213903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221213903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110606950 + 1110606951.

It is an arithmetic number, because the mean of its divisors is an integer number (1110606951).

Almost surely, 2^2221213901 is an apocalyptic number.

It is an amenable number.

2221213901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221213901 is an equidigital number, since it uses as much as digits as its factorization.

2221213901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2221213901 is about 47129.7560040363. The cubic root of 2221213901 is about 1304.7584783237.

The spelling of 2221213901 in words is "two billion, two hundred twenty-one million, two hundred thirteen thousand, nine hundred one".