21212022073 has 32 divisors (see below), whose sum is σ = 24286832640. Its totient is φ = 18348805440.

The previous prime is 21212022071. The next prime is 21212022127. The reversal of 21212022073 is 37022021212.

It is a cyclic number.

It is not a de Polignac number, because 21212022073 - 2¹ = 21212022071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212022071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14905840 + ... + 14907262.

It is an arithmetic number, because the mean of its divisors is an integer number (758963520).

Almost surely, 2^21212022073 is an apocalyptic number.

It is an amenable number.

21212022073 is a deficient number, since it is larger than the sum of its proper divisors (3074810567).

21212022073 is a wasteful number, since it uses less digits than its factorization.

21212022073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 21212022073 its reverse (37022021212), we get a palindrome (58234043285).

The spelling of 21212022073 in words is "twenty-one billion, two hundred twelve million, twenty-two thousand, seventy-three".