133540261621 has 16 divisors (see below), whose sum is σ = 145058715648. Its totient is φ = 122201352000.

The previous prime is 133540261549. The next prime is 133540261639. The reversal of 133540261621 is 126162045331.

It is not a de Polignac number, because 133540261621 - 2²¹ = 133538164469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133540261691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2116866 + ... + 2179036.

It is an arithmetic number, because the mean of its divisors is an integer number (9066169728).

Almost surely, 2^133540261621 is an apocalyptic number.

It is an amenable number.

133540261621 is a deficient number, since it is larger than the sum of its proper divisors (11518454027).

133540261621 is a wasteful number, since it uses less digits than its factorization.

133540261621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63612.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 133540261621 in words is "one hundred thirty-three billion, five hundred forty million, two hundred sixty-one thousand, six hundred twenty-one".