21121125533126 has 16 divisors (see below), whose sum is σ = 33374739782400. Its totient is φ = 9997065412488.

The previous prime is 21121125533113. The next prime is 21121125533143. The reversal of 21121125533126 is 62133552112112.

It is a super-2 number, since 2×21121125533126² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 213234866 + ... + 213333893.

It is an arithmetic number, because the mean of its divisors is an integer number (2085921236400).

Almost surely, 2^{21121125533126} is an apocalyptic number.

21121125533126 is a deficient number, since it is larger than the sum of its proper divisors (12253614249274).

21121125533126 is a wasteful number, since it uses less digits than its factorization.

21121125533126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426570083.

The product of its digits is 21600, while the sum is 35.

Adding to 21121125533126 its reverse (62133552112112), we get a palindrome (83254677645238).

The spelling of 21121125533126 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-five million, five hundred thirty-three thousand, one hundred twenty-six".