21234142476 has 36 divisors (see below), whose sum is σ = 53756703000. Its totient is φ = 7067299008.

The previous prime is 21234142471. The next prime is 21234142483. The reversal of 21234142476 is 67424143212.

21234142476 is a `hidden beast` number, since 2 + 12 + 34 + 142 + 476 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21234142476.

It is not an unprimeable number, because it can be changed into a prime (21234142471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 423801 + ... + 471248.

It is an arithmetic number, because the mean of its divisors is an integer number (1493241750).

Almost surely, 2^21234142476 is an apocalyptic number.

It is an amenable number.

21234142476 is an abundant number, since it is smaller than the sum of its proper divisors (32522560524).

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

21234142476 is a wasteful number, since it uses less digits than its factorization.

21234142476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895718 (or 895713 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

Adding to 21234142476 its reverse (67424143212), we get a palindrome (88658285688).

The spelling of 21234142476 in words is "twenty-one billion, two hundred thirty-four million, one hundred forty-two thousand, four hundred seventy-six".