2145230421 has 4 divisors (see below), whose sum is σ = 2860307232. Its totient is φ = 1430153612.

The previous prime is 2145230419. The next prime is 2145230429. The reversal of 2145230421 is 1240325412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2145230421 - 2¹ = 2145230419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2145230391 and 2145230400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145230429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357538401 + ... + 357538406.

It is an arithmetic number, because the mean of its divisors is an integer number (715076808).

Almost surely, 2^2145230421 is an apocalyptic number.

It is an amenable number.

2145230421 is a deficient number, since it is larger than the sum of its proper divisors (715076811).

2145230421 is an equidigital number, since it uses as much as digits as its factorization.

2145230421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715076810.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 2145230421 is about 46316.6322286066. The cubic root of 2145230421 is about 1289.7077680686.

Adding to 2145230421 its reverse (1240325412), we get a palindrome (3385555833).

The spelling of 2145230421 in words is "two billion, one hundred forty-five million, two hundred thirty thousand, four hundred twenty-one".