221111211101010 has 128 divisors (see below), whose sum is σ = 532718661441024. Its totient is φ = 58735559393280.

The previous prime is 221111211100993. The next prime is 221111211101021. The reversal of 221111211101010 is 10101112111122.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25482444792 + ... + 25482453468.

It is an arithmetic number, because the mean of its divisors is an integer number (4161864542508).

Almost surely, 2^{221111211101010} is an apocalyptic number.

221111211101010 is an abundant number, since it is smaller than the sum of its proper divisors (311607450340014).

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

221111211101010 is a wasteful number, since it uses less digits than its factorization.

221111211101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12228.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 221111211101010 its reverse (10101112111122), we get a palindrome (231212323212132).

The spelling of 221111211101010 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred eleven million, one hundred one thousand, ten".