1221158310 has 48 divisors (see below), whose sum is σ = 3093177456. Its totient is φ = 308500416.

The previous prime is 1221158287. The next prime is 1221158353. The reversal of 1221158310 is 138511221.

It is a super-2 number, since 2×1221158310² = 2982455236164112200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45549 + ... + 67208.

It is an arithmetic number, because the mean of its divisors is an integer number (64441197).

Almost surely, 2^1221158310 is an apocalyptic number.

1221158310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221158310 is an abundant number, since it is smaller than the sum of its proper divisors (1872019146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221158310 is a wasteful number, since it uses less digits than its factorization.

1221158310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112805 (or 112786 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 1221158310 is about 34945.0756187478. The cubic root of 1221158310 is about 1068.8677894868.

Adding to 1221158310 its reverse (138511221), we get a palindrome (1359669531).

The spelling of 1221158310 in words is "one billion, two hundred twenty-one million, one hundred fifty-eight thousand, three hundred ten".