2145131021 has 8 divisors (see below), whose sum is σ = 2363313888. Its totient is φ = 1930810000.

The previous prime is 2145131011. The next prime is 2145131059. The reversal of 2145131021 is 1201315412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145131021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145130984 and 2145131002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145131011) 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, 964295 + ... + 966516.

It is an arithmetic number, because the mean of its divisors is an integer number (295414236).

Almost surely, 2^2145131021 is an apocalyptic number.

It is an amenable number.

2145131021 is a deficient number, since it is larger than the sum of its proper divisors (218182867).

2145131021 is a wasteful number, since it uses less digits than its factorization.

2145131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930923.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2145131021 is about 46315.5591675195. The cubic root of 2145131021 is about 1289.6878480745.

Adding to 2145131021 its reverse (1201315412), we get a palindrome (3346446433).

The spelling of 2145131021 in words is "two billion, one hundred forty-five million, one hundred thirty-one thousand, twenty-one".