221020111212110 has 64 divisors (see below), whose sum is σ = 460200896064000. Its totient is φ = 74856708673152.

The previous prime is 221020111212083. The next prime is 221020111212119. The reversal of 221020111212110 is 11212111020122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020111212119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48354656 + ... + 52727724.

It is an arithmetic number, because the mean of its divisors is an integer number (7190639001000).

Almost surely, 2^{221020111212110} is an apocalyptic number.

221020111212110 is an abundant number, since it is smaller than the sum of its proper divisors (239180784851890).

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

221020111212110 is a wasteful number, since it uses less digits than its factorization.

221020111212110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381865.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221020111212110 its reverse (11212111020122), we get a palindrome (232232222232232).

The spelling of 221020111212110 in words is "two hundred twenty-one trillion, twenty billion, one hundred eleven million, two hundred twelve thousand, one hundred ten".