11721226580 has 24 divisors (see below), whose sum is σ = 28130944128. Its totient is φ = 4018706208.

The previous prime is 11721226547. The next prime is 11721226591. The reversal of 11721226580 is 8562212711.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a zygodrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 11721226580.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41861384 + ... + 41861663.

It is an arithmetic number, because the mean of its divisors is an integer number (1172122672).

Almost surely, 2^11721226580 is an apocalyptic number.

11721226580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11721226580 is an abundant number, since it is smaller than the sum of its proper divisors (16409717548).

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

11721226580 is a wasteful number, since it uses less digits than its factorization.

11721226580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83723063 (or 83723061 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 11721226580 in words is "eleven billion, seven hundred twenty-one million, two hundred twenty-six thousand, five hundred eighty".