201221122021012 has 12 divisors (see below), whose sum is σ = 352812850226676. Its totient is φ = 100417450527680.

The previous prime is 201221122020977. The next prime is 201221122021039. The reversal of 201221122021012 is 210120221122102.

It can be written as a sum of positive squares in 2 ways, for example, as 47182144393476 + 154038977627536 = 6868926^2 + 12411244^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48277618363 + ... + 48277622530.

It is an arithmetic number, because the mean of its divisors is an integer number (29401070852223).

Almost surely, 2^{201221122021012} is an apocalyptic number.

It is an amenable number.

201221122021012 is a deficient number, since it is larger than the sum of its proper divisors (151591728205664).

201221122021012 is a wasteful number, since it uses less digits than its factorization.

201221122021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96555241418 (or 96555241416 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201221122021012 its reverse (210120221122102), we get a palindrome (411341343143114).

The spelling of 201221122021012 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred twenty-two million, twenty-one thousand, twelve".