221112101020 has 24 divisors (see below), whose sum is σ = 479313975168. Its totient is φ = 85591780800.

The previous prime is 221112100933. The next prime is 221112101033. The reversal of 221112101020 is 20101211122.

It is a super-2 number, since 2×221112101020² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178315591 + ... + 178316830.

It is an arithmetic number, because the mean of its divisors is an integer number (19971415632).

Almost surely, 2^221112101020 is an apocalyptic number.

221112101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221112101020 is an abundant number, since it is smaller than the sum of its proper divisors (258201874148).

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

221112101020 is a wasteful number, since it uses less digits than its factorization.

221112101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356632461 (or 356632459 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221112101020 its reverse (20101211122), we get a palindrome (241213312142).

The spelling of 221112101020 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred one thousand, twenty".