21012131133 has 16 divisors (see below), whose sum is σ = 35576095360. Its totient is φ = 12006931968.

The previous prime is 21012131131. The next prime is 21012131143. The reversal of 21012131133 is 33113121012.

It is not a de Polignac number, because 21012131133 - 2¹ = 21012131131 is a prime.

It is a super-3 number, since 3×21012131133³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012131131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55587460 + ... + 55587837.

It is an arithmetic number, because the mean of its divisors is an integer number (2223505960).

Almost surely, 2^21012131133 is an apocalyptic number.

It is an amenable number.

21012131133 is a deficient number, since it is larger than the sum of its proper divisors (14563964227).

21012131133 is a wasteful number, since it uses less digits than its factorization.

21012131133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111175313 (or 111175307 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21012131133 its reverse (33113121012), we get a palindrome (54125252145).

The spelling of 21012131133 in words is "twenty-one billion, twelve million, one hundred thirty-one thousand, one hundred thirty-three".