212009474021 has 16 divisors (see below), whose sum is σ = 224225315328. Its totient is φ = 200131430400.

The previous prime is 212009473943. The next prime is 212009474063. The reversal of 212009474021 is 120474900212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-212009474021 is a prime.

It is a super-3 number, since 3×212009474021³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212009474071) 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, 9995990 + ... + 10017176.

It is an arithmetic number, because the mean of its divisors is an integer number (14014082208).

Almost surely, 2^212009474021 is an apocalyptic number.

It is an amenable number.

212009474021 is a deficient number, since it is larger than the sum of its proper divisors (12215841307).

212009474021 is a wasteful number, since it uses less digits than its factorization.

212009474021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29132.

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 212009474021 in words is "two hundred twelve billion, nine million, four hundred seventy-four thousand, twenty-one".