21111535531252 has 12 divisors (see below), whose sum is σ = 36975544778340. Its totient is φ = 10547094166016.

The previous prime is 21111535531213. The next prime is 21111535531253. The reversal of 21111535531252 is 25213553511112.

It can be written as a sum of positive squares in 2 ways, for example, as 10344238332516 + 10767297198736 = 3216246^2 + 3281356^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111535531253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2168394427 + ... + 2168404162.

It is an arithmetic number, because the mean of its divisors is an integer number (3081295398195).

Almost surely, 2^{21111535531252} is an apocalyptic number.

It is an amenable number.

21111535531252 is a deficient number, since it is larger than the sum of its proper divisors (15864009247088).

21111535531252 is a wasteful number, since it uses less digits than its factorization.

21111535531252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336799810 (or 4336799808 counting only the distinct ones).

The product of its digits is 45000, while the sum is 37.

The spelling of 21111535531252 in words is "twenty-one trillion, one hundred eleven billion, five hundred thirty-five million, five hundred thirty-one thousand, two hundred fifty-two".