1221042262 has 32 divisors (see below), whose sum is σ = 2101469184. Its totient is φ = 526680000.

The previous prime is 1221042259. The next prime is 1221042283. The reversal of 1221042262 is 2622401221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54762 + ... + 73762.

It is an arithmetic number, because the mean of its divisors is an integer number (65670912).

Almost surely, 2^1221042262 is an apocalyptic number.

1221042262 is a deficient number, since it is larger than the sum of its proper divisors (880426922).

1221042262 is a wasteful number, since it uses less digits than its factorization.

1221042262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19164.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1221042262 is about 34943.4151450599. The cubic root of 1221042262 is about 1068.8339298587.

Adding to 1221042262 its reverse (2622401221), we get a palindrome (3843443483).

The spelling of 1221042262 in words is "one billion, two hundred twenty-one million, forty-two thousand, two hundred sixty-two".