16172101021 has 16 divisors (see below), whose sum is σ = 17032768128. Its totient is φ = 15325024000.

The previous prime is 16172100977. The next prime is 16172101031. The reversal of 16172101021 is 12010127161.

It is a cyclic number.

It is not a de Polignac number, because 16172101021 - 2¹³ = 16172092829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16172100983 and 16172101001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16172101031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1636746 + ... + 1646596.

It is an arithmetic number, because the mean of its divisors is an integer number (1064548008).

Almost surely, 2^16172101021 is an apocalyptic number.

It is an amenable number.

16172101021 is a deficient number, since it is larger than the sum of its proper divisors (860667107).

16172101021 is a wasteful number, since it uses less digits than its factorization.

16172101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10532.

The product of its (nonzero) digits is 168, while the sum is 22.

Adding to 16172101021 its reverse (12010127161), we get a palindrome (28182228182).

The spelling of 16172101021 in words is "sixteen billion, one hundred seventy-two million, one hundred one thousand, twenty-one".