1221197364 has 48 divisors (see below), whose sum is σ = 3167955840. Its totient is φ = 406823040.

The previous prime is 1221197333. The next prime is 1221197371. The reversal of 1221197364 is 4637911221.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 335257 + ... + 338879.

It is an arithmetic number, because the mean of its divisors is an integer number (65999080).

Almost surely, 2^1221197364 is an apocalyptic number.

It is an amenable number.

1221197364 is an abundant number, since it is smaller than the sum of its proper divisors (1946758476).

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

1221197364 is a wasteful number, since it uses less digits than its factorization.

1221197364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6757 (or 6749 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 1221197364 is about 34945.6344054590. The cubic root of 1221197364 is about 1068.8791838920.

The spelling of 1221197364 in words is "one billion, two hundred twenty-one million, one hundred ninety-seven thousand, three hundred sixty-four".