21216601261163 has 8 divisors (see below), whose sum is σ = 26451866507520. Its totient is φ = 16532416567080.

The previous prime is 21216601261153. The next prime is 21216601261231. The reversal of 21216601261163 is 36116210661212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21216601261163 - 2⁴ = 21216601261147 is a prime.

It is a super-2 number, since 2×21216601261163² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21216601261153) 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, 137770137983 + ... + 137770138136.

It is an arithmetic number, because the mean of its divisors is an integer number (3306483313440).

Almost surely, 2^{21216601261163} is an apocalyptic number.

21216601261163 is a deficient number, since it is larger than the sum of its proper divisors (5235265246357).

21216601261163 is a wasteful number, since it uses less digits than its factorization.

21216601261163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275540276137.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 21216601261163 in words is "twenty-one trillion, two hundred sixteen billion, six hundred one million, two hundred sixty-one thousand, one hundred sixty-three".