1221211795 has 32 divisors (see below), whose sum is σ = 1637107200. Its totient is φ = 870211584.

The previous prime is 1221211793. The next prime is 1221211801. The reversal of 1221211795 is 5971121221.

It is a cyclic number.

It is not a de Polignac number, because 1221211795 - 2¹ = 1221211793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221211793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124179 + ... + 133651.

It is an arithmetic number, because the mean of its divisors is an integer number (51159600).

Almost surely, 2^1221211795 is an apocalyptic number.

1221211795 is a deficient number, since it is larger than the sum of its proper divisors (415895405).

1221211795 is a wasteful number, since it uses less digits than its factorization.

1221211795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9579.

The product of its digits is 2520, while the sum is 31.

The square root of 1221211795 is about 34945.8408827145. The cubic root of 1221211795 is about 1068.8833942228.

The spelling of 1221211795 in words is "one billion, two hundred twenty-one million, two hundred eleven thousand, seven hundred ninety-five".