2145222131 has 8 divisors (see below), whose sum is σ = 2366587104. Its totient is φ = 1931906880.

The previous prime is 2145222127. The next prime is 2145222139. The reversal of 2145222131 is 1312225412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2145222131 - 2² = 2145222127 is a prime.

It is a super-2 number, since 2×2145222131² = 9203955982664362322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145222097 and 2145222106.

It is not an unprimeable number, because it can be changed into a prime (2145222139) 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, 2011871 + ... + 2012936.

It is an arithmetic number, because the mean of its divisors is an integer number (295823388).

Almost surely, 2^2145222131 is an apocalyptic number.

2145222131 is a deficient number, since it is larger than the sum of its proper divisors (221364973).

2145222131 is a wasteful number, since it uses less digits than its factorization.

2145222131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024861.

The product of its digits is 960, while the sum is 23.

The square root of 2145222131 is about 46316.5427358304. The cubic root of 2145222131 is about 1289.7061067566.

Adding to 2145222131 its reverse (1312225412), we get a palindrome (3457447543).

The spelling of 2145222131 in words is "two billion, one hundred forty-five million, two hundred twenty-two thousand, one hundred thirty-one".