1221021352 has 16 divisors (see below), whose sum is σ = 2295905940. Its totient is φ = 608779776.

The previous prime is 1221021337. The next prime is 1221021391. The reversal of 1221021352 is 2531201221.

It can be written as a sum of positive squares in 2 ways, for example, as 1214801316 + 6220036 = 34854^2 + 2494^2 .

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, 213363 + ... + 219010.

Almost surely, 2^1221021352 is an apocalyptic number.

It is an amenable number.

1221021352 is a deficient number, since it is larger than the sum of its proper divisors (1074884588).

1221021352 is a wasteful number, since it uses less digits than its factorization.

1221021352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432732 (or 432728 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1221021352 is about 34943.1159457768. The cubic root of 1221021352 is about 1068.8278286653.

Adding to 1221021352 its reverse (2531201221), we get a palindrome (3752222573).

The spelling of 1221021352 in words is "one billion, two hundred twenty-one million, twenty-one thousand, three hundred fifty-two".