20111133021 has 8 divisors (see below), whose sum is σ = 30645536064. Its totient is φ = 11492076000.

The previous prime is 20111132989. The next prime is 20111133061. The reversal of 20111133021 is 12033111102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20111133021 - 2⁵ = 20111132989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111133061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478836480 + ... + 478836521.

It is an arithmetic number, because the mean of its divisors is an integer number (3830692008).

Almost surely, 2^20111133021 is an apocalyptic number.

20111133021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20111133021 is a deficient number, since it is larger than the sum of its proper divisors (10534403043).

20111133021 is an equidigital number, since it uses as much as digits as its factorization.

20111133021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957673011.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20111133021 its reverse (12033111102), we get a palindrome (32144244123).

The spelling of 20111133021 in words is "twenty billion, one hundred eleven million, one hundred thirty-three thousand, twenty-one".