1221101122 has 4 divisors (see below), whose sum is σ = 1831651686. Its totient is φ = 610550560.

The previous prime is 1221101113. The next prime is 1221101131. The reversal of 1221101122 is 2211011221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2211011221 = 3463 ⋅638467.

It is an interprime number because it is at equal distance from previous prime (1221101113) and next prime (1221101131).

It can be written as a sum of positive squares in only one way, i.e., 823058721 + 398042401 = 28689^2 + 19951^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305275279 + ... + 305275282.

Almost surely, 2^1221101122 is an apocalyptic number.

1221101122 is a deficient number, since it is larger than the sum of its proper divisors (610550564).

1221101122 is an equidigital number, since it uses as much as digits as its factorization.

1221101122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610550563.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1221101122 is about 34944.2573536769. The cubic root of 1221101122 is about 1068.8511038628.

Adding to 1221101122 its reverse (2211011221), we get a palindrome (3432112343).

The spelling of 1221101122 in words is "one billion, two hundred twenty-one million, one hundred one thousand, one hundred twenty-two".