1221211072 has 28 divisors (see below), whose sum is σ = 2454026080. Its totient is φ = 602873856.

The previous prime is 1221211067. The next prime is 1221211127. The reversal of 1221211072 is 2701121221.

It is a congruent number.

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, 115713 + ... + 125824.

Almost surely, 2^1221211072 is an apocalyptic number.

It is an amenable number.

1221211072 is an abundant number, since it is smaller than the sum of its proper divisors (1232815008).

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

1221211072 is an equidigital number, since it uses as much as digits as its factorization.

1221211072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241628 (or 241618 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 1221211072 is about 34945.8305381343. The cubic root of 1221211072 is about 1068.8831832840.

Adding to 1221211072 its reverse (2701121221), we get a palindrome (3922332293).

The spelling of 1221211072 in words is "one billion, two hundred twenty-one million, two hundred eleven thousand, seventy-two".