212210201021 has 24 divisors (see below), whose sum is σ = 270861746904. Its totient is φ = 164734577280.

The previous prime is 212210200987. The next prime is 212210201029. The reversal of 212210201021 is 120102012212.

It can be written as a sum of positive squares in 4 ways, for example, as 82779345796 + 129430855225 = 287714^2 + 359765^2 .

It is a de Polignac number, because none of the positive numbers 2^k-212210201021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212210200987 and 212210201005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212210201029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3109070 + ... + 3176591.

It is an arithmetic number, because the mean of its divisors is an integer number (11285906121).

Almost surely, 2^212210201021 is an apocalyptic number.

It is an amenable number.

212210201021 is a deficient number, since it is larger than the sum of its proper divisors (58651545883).

212210201021 is a wasteful number, since it uses less digits than its factorization.

212210201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6285741 (or 6285734 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212210201021 its reverse (120102012212), we get a palindrome (332312213233).

The spelling of 212210201021 in words is "two hundred twelve billion, two hundred ten million, two hundred one thousand, twenty-one".