2142221356 has 24 divisors (see below), whose sum is σ = 4091431680. Its totient is φ = 973323600.

The previous prime is 2142221353. The next prime is 2142221369. The reversal of 2142221356 is 6531222412.

It is a super-2 number, since 2×2142221356² = 9178224676204957472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2142221353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110305 + ... + 128263.

It is an arithmetic number, because the mean of its divisors is an integer number (170476320).

Almost surely, 2^2142221356 is an apocalyptic number.

It is an amenable number.

2142221356 is a deficient number, since it is larger than the sum of its proper divisors (1949210324).

2142221356 is a wasteful number, since it uses less digits than its factorization.

2142221356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20685 (or 20683 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 2142221356 is about 46284.1371962360. The cubic root of 2142221356 is about 1289.1044715040.

Adding to 2142221356 its reverse (6531222412), we get a palindrome (8673443768).

It can be divided in two parts, 21422 and 21356, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 2142221356 in words is "two billion, one hundred forty-two million, two hundred twenty-one thousand, three hundred fifty-six".