133021321421 has 18 divisors (see below), whose sum is σ = 142914397470. Its totient is φ = 123787704832.

The previous prime is 133021321397. The next prime is 133021321463. The reversal of 133021321421 is 124123120331.

It can be written as a sum of positive squares in 9 ways, for example, as 43149675625 + 89871645796 = 207725^2 + 299786^2 .

It is not a de Polignac number, because 133021321421 - 2²⁶ = 132954212557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133021326421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2260115 + ... + 2318223.

Almost surely, 2^133021321421 is an apocalyptic number.

It is an amenable number.

133021321421 is a deficient number, since it is larger than the sum of its proper divisors (9893076049).

133021321421 is an frugal number, since it uses more digits than its factorization.

133021321421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58321 (or 58215 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 133021321421 its reverse (124123120331), we get a palindrome (257144441752).

The spelling of 133021321421 in words is "one hundred thirty-three billion, twenty-one million, three hundred twenty-one thousand, four hundred twenty-one".