2213221301261 has 4 divisors (see below), whose sum is σ = 2214488172672. Its totient is φ = 2211954429852.

The previous prime is 2213221301257. The next prime is 2213221301273. The reversal of 2213221301261 is 1621031223122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2213221301261 - 2² = 2213221301257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2213221301261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2213221331261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633433085 + ... + 633436578.

It is an arithmetic number, because the mean of its divisors is an integer number (553622043168).

Almost surely, 2^{2213221301261} is an apocalyptic number.

It is an amenable number.

2213221301261 is a deficient number, since it is larger than the sum of its proper divisors (1266871411).

2213221301261 is a wasteful number, since it uses less digits than its factorization.

2213221301261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266871410.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 2213221301261 its reverse (1621031223122), we get a palindrome (3834252524383).

The spelling of 2213221301261 in words is "two trillion, two hundred thirteen billion, two hundred twenty-one million, three hundred one thousand, two hundred sixty-one".