11721751433 has 12 divisors (see below), whose sum is σ = 13733611920. Its totient is φ = 9974927592.

The previous prime is 11721751429. The next prime is 11721751463. The reversal of 11721751433 is 33415712711.

It is not a de Polignac number, because 11721751433 - 2² = 11721751429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11721751393 and 11721751402.

It is not an unprimeable number, because it can be changed into a prime (11721751463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 853691 + ... + 867312.

It is an arithmetic number, because the mean of its divisors is an integer number (1144467660).

Almost surely, 2^11721751433 is an apocalyptic number.

It is an amenable number.

11721751433 is a deficient number, since it is larger than the sum of its proper divisors (2011860487).

11721751433 is a wasteful number, since it uses less digits than its factorization.

11721751433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721156 (or 1721149 counting only the distinct ones).

The product of its digits is 17640, while the sum is 35.

The spelling of 11721751433 in words is "eleven billion, seven hundred twenty-one million, seven hundred fifty-one thousand, four hundred thirty-three".