16721157044 has 24 divisors (see below), whose sum is σ = 30603914880. Its totient is φ = 7978839264.

The previous prime is 16721157029. The next prime is 16721157049. The reversal of 16721157044 is 44075112761.

It is a super-2 number, since 2×16721157044² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16721156989 and 16721157007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721157049) 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, 166619 + ... + 247394.

It is an arithmetic number, because the mean of its divisors is an integer number (1275163120).

Almost surely, 2^16721157044 is an apocalyptic number.

It is an amenable number.

16721157044 is a deficient number, since it is larger than the sum of its proper divisors (13882757836).

16721157044 is a wasteful number, since it uses less digits than its factorization.

16721157044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414479 (or 414477 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The spelling of 16721157044 in words is "sixteen billion, seven hundred twenty-one million, one hundred fifty-seven thousand, forty-four".