21711020073 has 32 divisors (see below), whose sum is σ = 30776716800. Its totient is φ = 13575211776.

The previous prime is 21711020017. The next prime is 21711020083. The reversal of 21711020073 is 37002011712.

It is not a de Polignac number, because 21711020073 - 2¹⁴ = 21711003689 is a prime.

It is a super-2 number, since 2×21711020073² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21711020083) 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, 8417098 + ... + 8419676.

It is an arithmetic number, because the mean of its divisors is an integer number (961772400).

Almost surely, 2^21711020073 is an apocalyptic number.

It is an amenable number.

21711020073 is a deficient number, since it is larger than the sum of its proper divisors (9065696727).

21711020073 is a wasteful number, since it uses less digits than its factorization.

21711020073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4021.

The product of its (nonzero) digits is 588, while the sum is 24.

Adding to 21711020073 its reverse (37002011712), we get a palindrome (58713031785).

The spelling of 21711020073 in words is "twenty-one billion, seven hundred eleven million, twenty thousand, seventy-three".