1221100396 has 12 divisors (see below), whose sum is σ = 2142004480. Its totient is φ = 609099120.

The previous prime is 1221100367. The next prime is 1221100411. The reversal of 1221100396 is 6930011221.

It is a super-2 number, since 2×1221100396² = 2982172354222713632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221100396.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360876 + ... + 364243.

Almost surely, 2^1221100396 is an apocalyptic number.

It is an amenable number.

1221100396 is a deficient number, since it is larger than the sum of its proper divisors (920904084).

1221100396 is a wasteful number, since it uses less digits than its factorization.

1221100396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725544 (or 725542 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1221100396 is about 34944.2469657024. The cubic root of 1221100396 is about 1068.8508920359.

The spelling of 1221100396 in words is "one billion, two hundred twenty-one million, one hundred thousand, three hundred ninety-six".