133661221240 has 32 divisors (see below), whose sum is σ = 301395858480. Its totient is φ = 53347491072.

The previous prime is 133661221231. The next prime is 133661221249. The reversal of 133661221240 is 42122166331.

It is an interprime number because it is at equal distance from previous prime (133661221231) and next prime (133661221249).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133661221249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3637662 + ... + 3674221.

Almost surely, 2^133661221240 is an apocalyptic number.

133661221240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133661221240 is an abundant number, since it is smaller than the sum of its proper divisors (167734637240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133661221240 is a wasteful number, since it uses less digits than its factorization.

133661221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7312351 (or 7312347 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 133661221240 its reverse (42122166331), we get a palindrome (175783387571).

The spelling of 133661221240 in words is "one hundred thirty-three billion, six hundred sixty-one million, two hundred twenty-one thousand, two hundred forty".