21121334430 has 64 divisors (see below), whose sum is σ = 57961612800. Its totient is φ = 4825332864.

The previous prime is 21121334419. The next prime is 21121334431. The reversal of 21121334430 is 3443312112.

It is a happy number.

It is a super-2 number, since 2×21121334430² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121334430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121334431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 416832 + ... + 464748.

It is an arithmetic number, because the mean of its divisors is an integer number (905650200).

Almost surely, 2^21121334430 is an apocalyptic number.

21121334430 is an abundant number, since it is smaller than the sum of its proper divisors (36840278370).

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

21121334430 is a wasteful number, since it uses less digits than its factorization.

21121334430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50033.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21121334430 its reverse (3443312112), we get a palindrome (24564646542).

The spelling of 21121334430 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirty-four thousand, four hundred thirty".