21040234151 has 4 divisors (see below), whose sum is σ = 21293731032. Its totient is φ = 20786737272.

The previous prime is 21040234129. The next prime is 21040234157. The reversal of 21040234151 is 15143204012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21040234151 - 2²⁶ = 20973125287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040234157) 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 3 ways as a sum of consecutive naturals, for example, 126748316 + ... + 126748481.

It is an arithmetic number, because the mean of its divisors is an integer number (5323432758).

Almost surely, 2^21040234151 is an apocalyptic number.

21040234151 is a deficient number, since it is larger than the sum of its proper divisors (253496881).

21040234151 is an equidigital number, since it uses as much as digits as its factorization.

21040234151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253496880.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21040234151 its reverse (15143204012), we get a palindrome (36183438163).

The spelling of 21040234151 in words is "twenty-one billion, forty million, two hundred thirty-four thousand, one hundred fifty-one".