1213221095 has 4 divisors (see below), whose sum is σ = 1455865320. Its totient is φ = 970576872.

The previous prime is 1213221077. The next prime is 1213221137. The reversal of 1213221095 is 5901223121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213221095 - 2¹⁸ = 1212958951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121322105 + ... + 121322114.

It is an arithmetic number, because the mean of its divisors is an integer number (363966330).

Almost surely, 2^1213221095 is an apocalyptic number.

1213221095 is a deficient number, since it is larger than the sum of its proper divisors (242644225).

1213221095 is an equidigital number, since it uses as much as digits as its factorization.

1213221095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242644224.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1213221095 is about 34831.3234747117. The cubic root of 1213221095 is about 1066.5469653545.

The spelling of 1213221095 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, ninety-five".