21346131073 has 16 divisors (see below), whose sum is σ = 22856985216. Its totient is φ = 19864247040.

The previous prime is 21346131067. The next prime is 21346131109. The reversal of 21346131073 is 37013164312.

It is not a de Polignac number, because 21346131073 - 2¹³ = 21346122881 is a prime.

It is a super-2 number, since 2×21346131073² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21346131013) 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, 1148190 + ... + 1166632.

It is an arithmetic number, because the mean of its divisors is an integer number (1428561576).

Almost surely, 2^21346131073 is an apocalyptic number.

It is an amenable number.

21346131073 is a deficient number, since it is larger than the sum of its proper divisors (1510854143).

21346131073 is a wasteful number, since it uses less digits than its factorization.

21346131073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19224.

The product of its (nonzero) digits is 9072, while the sum is 31.

Adding to 21346131073 its reverse (37013164312), we get a palindrome (58359295385).

The spelling of 21346131073 in words is "twenty-one billion, three hundred forty-six million, one hundred thirty-one thousand, seventy-three".