21003121134 has 48 divisors (see below), whose sum is σ = 46142944848. Its totient is φ = 6903691776.

The previous prime is 21003121123. The next prime is 21003121141. The reversal of 21003121134 is 43112130012.

It is a super-2 number, since 2×21003121134² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 461929 + ... + 505355.

It is an arithmetic number, because the mean of its divisors is an integer number (961311351).

Almost surely, 2^21003121134 is an apocalyptic number.

21003121134 is an abundant number, since it is smaller than the sum of its proper divisors (25139823714).

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

21003121134 is a wasteful number, since it uses less digits than its factorization.

21003121134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43809 (or 43806 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21003121134 its reverse (43112130012), we get a palindrome (64115251146).

The spelling of 21003121134 in words is "twenty-one billion, three million, one hundred twenty-one thousand, one hundred thirty-four".