2145404421231 has 16 divisors (see below), whose sum is σ = 2985135987456. Its totient is φ = 1367980630016.

The previous prime is 2145404421217. The next prime is 2145404421257. The reversal of 2145404421231 is 1321244045412.

It is a cyclic number.

It is not a de Polignac number, because 2145404421231 - 2¹⁹ = 2145403896943 is a prime.

It is a super-2 number, since 2×2145404421231² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2145404421192 and 2145404421201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145404421331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249165 + ... + 2086358.

It is an arithmetic number, because the mean of its divisors is an integer number (186570999216).

Almost surely, 2^{2145404421231} is an apocalyptic number.

2145404421231 is a deficient number, since it is larger than the sum of its proper divisors (839731566225).

2145404421231 is a wasteful number, since it uses less digits than its factorization.

2145404421231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348862.

The product of its (nonzero) digits is 30720, while the sum is 33.

Adding to 2145404421231 its reverse (1321244045412), we get a palindrome (3466648466643).

The spelling of 2145404421231 in words is "two trillion, one hundred forty-five billion, four hundred four million, four hundred twenty-one thousand, two hundred thirty-one".