201221021012 has 24 divisors (see below), whose sum is σ = 400851364032. Its totient is φ = 87487400000.

The previous prime is 201221021011. The next prime is 201221021051. The reversal of 201221021012 is 210120122102.

It is a super-2 number, since 2×201221021012² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221021011) 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, 99416489 + ... + 99418512.

It is an arithmetic number, because the mean of its divisors is an integer number (16702140168).

Almost surely, 2^201221021012 is an apocalyptic number.

201221021012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

201221021012 is a deficient number, since it is larger than the sum of its proper divisors (199630343020).

201221021012 is a wasteful number, since it uses less digits than its factorization.

201221021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198835039 (or 198835037 counting only the distinct ones).

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

Adding to 201221021012 its reverse (210120122102), we get a palindrome (411341143114).

The spelling of 201221021012 in words is "two hundred one billion, two hundred twenty-one million, twenty-one thousand, twelve".