133221001021 has 4 divisors (see below), whose sum is σ = 133572508000. Its totient is φ = 132869494044.

The previous prime is 133221001013. The next prime is 133221001061. The reversal of 133221001021 is 120100122331.

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 133221001021 - 2³ = 133221001013 is a prime.

It is a super-2 number, since 2×133221001021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133221000986 and 133221001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133221001061) 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, 175752921 + ... + 175753678.

It is an arithmetic number, because the mean of its divisors is an integer number (33393127000).

Almost surely, 2^133221001021 is an apocalyptic number.

It is an amenable number.

133221001021 is a deficient number, since it is larger than the sum of its proper divisors (351506979).

133221001021 is an equidigital number, since it uses as much as digits as its factorization.

133221001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351506978.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 133221001021 its reverse (120100122331), we get a palindrome (253321123352).

The spelling of 133221001021 in words is "one hundred thirty-three billion, two hundred twenty-one million, one thousand, twenty-one".