16721060421 has 32 divisors (see below), whose sum is σ = 25586749440. Its totient is φ = 9633057984.

The previous prime is 16721060383. The next prime is 16721060423. The reversal of 16721060421 is 12406012761.

It is not a de Polignac number, because 16721060421 - 2⁶ = 16721060357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721060423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156151 + ... + 240468.

It is an arithmetic number, because the mean of its divisors is an integer number (799585920).

Almost surely, 2^16721060421 is an apocalyptic number.

It is an amenable number.

16721060421 is a deficient number, since it is larger than the sum of its proper divisors (8865689019).

16721060421 is a wasteful number, since it uses less digits than its factorization.

16721060421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396705.

The product of its (nonzero) digits is 4032, while the sum is 30.

The spelling of 16721060421 in words is "sixteen billion, seven hundred twenty-one million, sixty thousand, four hundred twenty-one".