133531351643021 has 4 divisors (see below), whose sum is σ = 133531401364092. Its totient is φ = 133531301921952.

The previous prime is 133531351643009. The next prime is 133531351643059. The reversal of 133531351643021 is 120346153135331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66928940982121 + 66602410660900 = 8181011^2 + 8161030^2 .

It is a cyclic number.

It is not a de Polignac number, because 133531351643021 - 2⁶ = 133531351642957 is a prime.

It is a super-2 number, since 2×133531351643021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133531351643021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133531381643021) 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, 20587280 + ... + 26284953.

It is an arithmetic number, because the mean of its divisors is an integer number (33382850341023).

Almost surely, 2^{133531351643021} is an apocalyptic number.

It is an amenable number.

133531351643021 is a deficient number, since it is larger than the sum of its proper divisors (49721071).

133531351643021 is an equidigital number, since it uses as much as digits as its factorization.

133531351643021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49721070.

The product of its (nonzero) digits is 291600, while the sum is 41.

The spelling of 133531351643021 in words is "one hundred thirty-three trillion, five hundred thirty-one billion, three hundred fifty-one million, six hundred forty-three thousand, twenty-one".