21040150423 has 2 divisors, whose sum is σ = 21040150424. Its totient is φ = 21040150422.

The previous prime is 21040150409. The next prime is 21040150457. The reversal of 21040150423 is 32405104012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21040150423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21040150394 and 21040150403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21040150493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520075211 + 10520075212.

It is an arithmetic number, because the mean of its divisors is an integer number (10520075212).

Almost surely, 2^21040150423 is an apocalyptic number.

21040150423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040150423 is an equidigital number, since it uses as much as digits as its factorization.

21040150423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21040150423 its reverse (32405104012), we get a palindrome (53445254435).

The spelling of 21040150423 in words is "twenty-one billion, forty million, one hundred fifty thousand, four hundred twenty-three".