212660506021 has 8 divisors (see below), whose sum is σ = 215671120704. Its totient is φ = 209668082880.

The previous prime is 212660505961. The next prime is 212660506031. The reversal of 212660506021 is 120605066212.

212660506021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212660506021 - 2¹¹ = 212660503973 is a prime.

It is a super-2 number, since 2×212660506021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212660506031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4524340 + ... + 4571101.

It is an arithmetic number, because the mean of its divisors is an integer number (26958890088).

Almost surely, 2^212660506021 is an apocalyptic number.

It is an amenable number.

212660506021 is a deficient number, since it is larger than the sum of its proper divisors (3010614683).

212660506021 is a wasteful number, since it uses less digits than its factorization.

212660506021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9095771.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 212660506021 in words is "two hundred twelve billion, six hundred sixty million, five hundred six thousand, twenty-one".