133212538261 has 4 divisors (see below), whose sum is σ = 145322769024. Its totient is φ = 121102307500.

The previous prime is 133212538253. The next prime is 133212538267. The reversal of 133212538261 is 162835212331.

It is a happy number.

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 133212538261 - 2³ = 133212538253 is a prime.

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 133212538261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133212538267) 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, 6055115365 + ... + 6055115386.

It is an arithmetic number, because the mean of its divisors is an integer number (36330692256).

Almost surely, 2^133212538261 is an apocalyptic number.

133212538261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133212538261 is a deficient number, since it is larger than the sum of its proper divisors (12110230763).

133212538261 is a wasteful number, since it uses less digits than its factorization.

133212538261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12110230762.

The product of its digits is 51840, while the sum is 37.

The spelling of 133212538261 in words is "one hundred thirty-three billion, two hundred twelve million, five hundred thirty-eight thousand, two hundred sixty-one".