221111102021010 has 64 divisors (see below), whose sum is σ = 533689505412480. Its totient is φ = 58627159050240.

The previous prime is 221111102020997. The next prime is 221111102021039. The reversal of 221111102021010 is 10120201111122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47059554 + ... + 51544386.

It is an arithmetic number, because the mean of its divisors is an integer number (8338898522070).

Almost surely, 2^{221111102021010} is an apocalyptic number.

221111102021010 is an abundant number, since it is smaller than the sum of its proper divisors (312578403391470).

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

221111102021010 is a wasteful number, since it uses less digits than its factorization.

221111102021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4494203.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221111102021010 its reverse (10120201111122), we get a palindrome (231231303132132).

The spelling of 221111102021010 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred two million, twenty-one thousand, ten".