1221401402 has 8 divisors (see below), whose sum is σ = 1973033076. Its totient is φ = 563723712.

The previous prime is 1221401371. The next prime is 1221401429. The reversal of 1221401402 is 2041041221.

It can be written as a sum of positive squares in 2 ways, for example, as 1006221841 + 215179561 = 31721^2 + 14669^2 .

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, 23488463 + ... + 23488514.

Almost surely, 2^1221401402 is an apocalyptic number.

1221401402 is a deficient number, since it is larger than the sum of its proper divisors (751631674).

1221401402 is a wasteful number, since it uses less digits than its factorization.

1221401402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46976992.

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

The square root of 1221401402 is about 34948.5536467534. The cubic root of 1221401402 is about 1068.9387101220.

Adding to 1221401402 its reverse (2041041221), we get a palindrome (3262442623).

The spelling of 1221401402 in words is "one billion, two hundred twenty-one million, four hundred one thousand, four hundred two".