1222761221 has 4 divisors (see below), whose sum is σ = 1333921344. Its totient is φ = 1111601100.

The previous prime is 1222761217. The next prime is 1222761263. The reversal of 1222761221 is 1221672221.

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 1222761221 - 2² = 1222761217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222760221) 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, 55580045 + ... + 55580066.

It is an arithmetic number, because the mean of its divisors is an integer number (333480336).

Almost surely, 2^1222761221 is an apocalyptic number.

1222761221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222761221 is a deficient number, since it is larger than the sum of its proper divisors (111160123).

1222761221 is a wasteful number, since it uses less digits than its factorization.

1222761221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111160122.

The product of its digits is 1344, while the sum is 26.

The square root of 1222761221 is about 34968.0028168610. The cubic root of 1222761221 is about 1069.3352557263.

The spelling of 1222761221 in words is "one billion, two hundred twenty-two million, seven hundred sixty-one thousand, two hundred twenty-one".