16721226072 has 24 divisors (see below), whose sum is σ = 45286654140. Its totient is φ = 5573742000.

The previous prime is 16721226037. The next prime is 16721226077. The reversal of 16721226072 is 27062212761.

It is a happy number.

16721226072 is a `hidden beast` number, since 1 + 6 + 7 + 21 + 22 + 607 + 2 = 666.

16721226072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721226077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116119554 + ... + 116119697.

Almost surely, 2^16721226072 is an apocalyptic number.

16721226072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16721226072 is an abundant number, since it is smaller than the sum of its proper divisors (28565428068).

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

16721226072 is a wasteful number, since it uses less digits than its factorization.

16721226072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232239263 (or 232239256 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 16721226072 in words is "sixteen billion, seven hundred twenty-one million, two hundred twenty-six thousand, seventy-two".