2142403221 has 48 divisors (see below), whose sum is σ = 3373816320. Its totient is φ = 1184244000.

The previous prime is 2142403201. The next prime is 2142403229. The reversal of 2142403221 is 1223042412.

It is not a de Polignac number, because 2142403221 - 2⁷ = 2142403093 is a prime.

It is a super-2 number, since 2×2142403221² = 9179783122702349682, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142403229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8535346 + ... + 8535596.

It is an arithmetic number, because the mean of its divisors is an integer number (70287840).

Almost surely, 2^2142403221 is an apocalyptic number.

2142403221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2142403221 is a deficient number, since it is larger than the sum of its proper divisors (1231413099).

2142403221 is an equidigital number, since it uses as much as digits as its factorization.

2142403221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 403 counting only the distinct ones).

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

The square root of 2142403221 is about 46286.1018125312. The cubic root of 2142403221 is about 1289.1409502040.

Adding to 2142403221 its reverse (1223042412), we get a palindrome (3365445633).

The spelling of 2142403221 in words is "two billion, one hundred forty-two million, four hundred three thousand, two hundred twenty-one".