1221432402 has 32 divisors (see below), whose sum is σ = 2487858624. Its totient is φ = 399672000.

The previous prime is 1221432397. The next prime is 1221432403. The reversal of 1221432402 is 2042341221.

It is a super-2 number, since 2×1221432402² = 2983794225310979208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221432403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197152 + ... + 203252.

It is an arithmetic number, because the mean of its divisors is an integer number (77745582).

Almost surely, 2^1221432402 is an apocalyptic number.

1221432402 is an abundant number, since it is smaller than the sum of its proper divisors (1266426222).

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

1221432402 is a wasteful number, since it uses less digits than its factorization.

1221432402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6714.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1221432402 is about 34948.9971529942. The cubic root of 1221432402 is about 1068.9477535098.

Adding to 1221432402 its reverse (2042341221), we get a palindrome (3263773623).

The spelling of 1221432402 in words is "one billion, two hundred twenty-one million, four hundred thirty-two thousand, four hundred two".