10212011221 has 8 divisors (see below), whose sum is σ = 10406189880. Its totient is φ = 10017888192.

The previous prime is 10212011191. The next prime is 10212011261. The reversal of 10212011221 is 12211021201.

It can be written as a sum of positive squares in 4 ways, for example, as 4051959025 + 6160052196 = 63655^2 + 78486^2 .

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 10212011221 - 2⁵ = 10212011189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212011261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725971 + ... + 739903.

It is an arithmetic number, because the mean of its divisors is an integer number (1300773735).

Almost surely, 2^10212011221 is an apocalyptic number.

It is an amenable number.

10212011221 is a deficient number, since it is larger than the sum of its proper divisors (194178659).

10212011221 is a wasteful number, since it uses less digits than its factorization.

10212011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27815.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10212011221 its reverse (12211021201), we get a palindrome (22423032422).

It can be divided in two parts, 1021201 and 1221, that multiplied together give a palindrome (1246886421).

The spelling of 10212011221 in words is "ten billion, two hundred twelve million, eleven thousand, two hundred twenty-one".