1221220310 has 32 divisors (see below), whose sum is σ = 2215188000. Its totient is φ = 484728832.

The previous prime is 1221220303. The next prime is 1221220327. The reversal of 1221220310 is 130221221.

It is a happy number.

It is a super-2 number, since 2×1221220310² = 2982758091112992200, 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 15 ways as a sum of consecutive naturals, for example, 813941 + ... + 815439.

It is an arithmetic number, because the mean of its divisors is an integer number (69224625).

Almost surely, 2^1221220310 is an apocalyptic number.

1221220310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221220310 is a deficient number, since it is larger than the sum of its proper divisors (993967690).

1221220310 is a wasteful number, since it uses less digits than its factorization.

1221220310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1221220310 is about 34945.9627138816. The cubic root of 1221220310 is about 1068.8858785096.

Adding to 1221220310 its reverse (130221221), we get a palindrome (1351441531).

The spelling of 1221220310 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, three hundred ten".