1221356464 has 10 divisors (see below), whose sum is σ = 2366378180. Its totient is φ = 610678224.

The previous prime is 1221356459. The next prime is 1221356491. The reversal of 1221356464 is 4646531221.

It is a super-2 number, since 2×1221356464² = 2983423224309166592, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38167374 + ... + 38167405.

It is an arithmetic number, because the mean of its divisors is an integer number (236637818).

Almost surely, 2^1221356464 is an apocalyptic number.

It is an amenable number.

1221356464 is a deficient number, since it is larger than the sum of its proper divisors (1145021716).

1221356464 is an equidigital number, since it uses as much as digits as its factorization.

1221356464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76334787 (or 76334781 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 1221356464 is about 34947.9107243910. The cubic root of 1221356464 is about 1068.9256004387.

Adding to 1221356464 its reverse (4646531221), we get a palindrome (5867887685).

The spelling of 1221356464 in words is "one billion, two hundred twenty-one million, three hundred fifty-six thousand, four hundred sixty-four".