201221002010 has 128 divisors (see below), whose sum is σ = 440884270080. Its totient is φ = 64548864000.

The previous prime is 201221002009. The next prime is 201221002013. The reversal of 201221002010 is 10200122102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 201221001982 and 201221002000.

It is not an unprimeable number, because it can be changed into a prime (201221002013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 195170195 + ... + 195171225.

It is an arithmetic number, because the mean of its divisors is an integer number (3444408360).

Almost surely, 2^201221002010 is an apocalyptic number.

201221002010 is an abundant number, since it is smaller than the sum of its proper divisors (239663268070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201221002010 is a wasteful number, since it uses less digits than its factorization.

201221002010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 201221002010 its reverse (10200122102), we get a palindrome (211421124112).

The spelling of 201221002010 in words is "two hundred one billion, two hundred twenty-one million, two thousand, ten".