21423425162187 has 16 divisors (see below), whose sum is σ = 29115328245120. Its totient is φ = 14008732533312.

The previous prime is 21423425162093. The next prime is 21423425162197. The reversal of 21423425162187 is 78126152432412.

It is not a de Polignac number, because 21423425162187 - 2¹⁵ = 21423425129419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21423425162197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228674637 + ... + 228768302.

It is an arithmetic number, because the mean of its divisors is an integer number (1819708015320).

Almost surely, 2^{21423425162187} is an apocalyptic number.

21423425162187 is a deficient number, since it is larger than the sum of its proper divisors (7691903082933).

21423425162187 is a wasteful number, since it uses less digits than its factorization.

21423425162187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457443242.

The product of its digits is 1290240, while the sum is 48.

Adding to 21423425162187 its reverse (78126152432412), we get a palindrome (99549577594599).

The spelling of 21423425162187 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-five million, one hundred sixty-two thousand, one hundred eighty-seven".