1221140402 has 8 divisors (see below), whose sum is σ = 1874308656. Its totient is φ = 596370852.

The previous prime is 1221140339. The next prime is 1221140411. The reversal of 1221140402 is 2040411221.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 7099568 + ... + 7099739.

It is an arithmetic number, because the mean of its divisors is an integer number (234288582).

Almost surely, 2^1221140402 is an apocalyptic number.

1221140402 is a deficient number, since it is larger than the sum of its proper divisors (653168254).

1221140402 is a wasteful number, since it uses less digits than its factorization.

1221140402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14199352.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1221140402 is about 34944.8193871424. The cubic root of 1221140402 is about 1068.8625645628.

Adding to 1221140402 its reverse (2040411221), we get a palindrome (3261551623).

The spelling of 1221140402 in words is "one billion, two hundred twenty-one million, one hundred forty thousand, four hundred two".