2143221402 has 32 divisors (see below), whose sum is σ = 4949304192. Its totient is φ = 606034944.

The previous prime is 2143221391. The next prime is 2143221403. The reversal of 2143221402 is 2041223412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2143221403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258963 + ... + 267110.

It is an arithmetic number, because the mean of its divisors is an integer number (154665756).

Almost surely, 2^2143221402 is an apocalyptic number.

2143221402 is an abundant number, since it is smaller than the sum of its proper divisors (2806082790).

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

2143221402 is a wasteful number, since it uses less digits than its factorization.

2143221402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526182.

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

The square root of 2143221402 is about 46294.9392698597. The cubic root of 2143221402 is about 1289.3050364010.

Adding to 2143221402 its reverse (2041223412), we get a palindrome (4184444814).

The spelling of 2143221402 in words is "two billion, one hundred forty-three million, two hundred twenty-one thousand, four hundred two".