10212745221 has 32 divisors (see below), whose sum is σ = 17395015680. Its totient is φ = 5800891248.

The previous prime is 10212745171. The next prime is 10212745273. The reversal of 10212745221 is 12254721201.

It is a happy number.

10212745221 is a `hidden beast` number, since 10 + 2 + 127 + 4 + 522 + 1 = 666.

It is not a de Polignac number, because 10212745221 - 2⁷ = 10212745093 is a prime.

It is a super-3 number, since 3×10212745221³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212745321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130221 + ... + 193346.

It is an arithmetic number, because the mean of its divisors is an integer number (543594240).

Almost surely, 2^10212745221 is an apocalyptic number.

It is an amenable number.

10212745221 is a deficient number, since it is larger than the sum of its proper divisors (7182270459).

10212745221 is a wasteful number, since it uses less digits than its factorization.

10212745221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323750 (or 323744 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The spelling of 10212745221 in words is "ten billion, two hundred twelve million, seven hundred forty-five thousand, two hundred twenty-one".