20133001021 has 4 divisors (see below), whose sum is σ = 23009144032. Its totient is φ = 17256858012.

The previous prime is 20133001019. The next prime is 20133001037. The reversal of 20133001021 is 12010033102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20133001021 - 2¹ = 20133001019 is a prime.

It is a super-2 number, since 2×20133001021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20133000992 and 20133001010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133001081) 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, 1438071495 + ... + 1438071508.

It is an arithmetic number, because the mean of its divisors is an integer number (5752286008).

Almost surely, 2^20133001021 is an apocalyptic number.

It is an amenable number.

20133001021 is a deficient number, since it is larger than the sum of its proper divisors (2876143011).

20133001021 is an equidigital number, since it uses as much as digits as its factorization.

20133001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2876143010.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 20133001021 its reverse (12010033102), we get a palindrome (32143034123).

The spelling of 20133001021 in words is "twenty billion, one hundred thirty-three million, one thousand, twenty-one".