21243022134 has 16 divisors (see below), whose sum is σ = 44333263872. Its totient is φ = 6773137448.

The previous prime is 21243022133. The next prime is 21243022169. The reversal of 21243022134 is 43122034212.

It is a happy number.

It is a super-2 number, since 2×21243022134² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243022133) 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 7 ways as a sum of consecutive naturals, for example, 76967334 + ... + 76967609.

It is an arithmetic number, because the mean of its divisors is an integer number (2770828992).

Almost surely, 2^21243022134 is an apocalyptic number.

21243022134 is an abundant number, since it is smaller than the sum of its proper divisors (23090241738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21243022134 is a wasteful number, since it uses less digits than its factorization.

21243022134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153934971.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21243022134 its reverse (43122034212), we get a palindrome (64365056346).

The spelling of 21243022134 in words is "twenty-one billion, two hundred forty-three million, twenty-two thousand, one hundred thirty-four".