21121121332 has 12 divisors (see below), whose sum is σ = 36981419076. Its totient is φ = 10555001600.

The previous prime is 21121121327. The next prime is 21121121347. The reversal of 21121121332 is 23312112112.

It can be written as a sum of positive squares in 2 ways, for example, as 1648035216 + 19473086116 = 40596^2 + 139546^2 .

It is a super-2 number, since 2×21121121332² (a number of 21 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1381213 + ... + 1396420.

It is an arithmetic number, because the mean of its divisors is an integer number (3081784923).

Almost surely, 2^21121121332 is an apocalyptic number.

It is an amenable number.

21121121332 is a deficient number, since it is larger than the sum of its proper divisors (15860297744).

21121121332 is a wasteful number, since it uses less digits than its factorization.

21121121332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779538 (or 2779536 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 21121121332 its reverse (23312112112), we get a palindrome (44433233444).

The spelling of 21121121332 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, three hundred thirty-two".