21955170073 has 16 divisors (see below), whose sum is σ = 23904316800. Its totient is φ = 20095240320.

The previous prime is 21955170059. The next prime is 21955170079. The reversal of 21955170073 is 37007155912.

It is a cyclic number.

It is not a de Polignac number, because 21955170073 - 2¹³ = 21955161881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21955170079) 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, 56578 + ... + 217051.

It is an arithmetic number, because the mean of its divisors is an integer number (1494019800).

Almost surely, 2^21955170073 is an apocalyptic number.

It is an amenable number.

21955170073 is a deficient number, since it is larger than the sum of its proper divisors (1949146727).

21955170073 is a wasteful number, since it uses less digits than its factorization.

21955170073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273792.

The product of its (nonzero) digits is 66150, while the sum is 40.

The spelling of 21955170073 in words is "twenty-one billion, nine hundred fifty-five million, one hundred seventy thousand, seventy-three".