102111221010 has 128 divisors (see below), whose sum is σ = 267918969600. Its totient is φ = 24816844800.

The previous prime is 102111220949. The next prime is 102111221027. The reversal of 102111221010 is 10122111201.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1849810 + ... + 1904210.

It is an arithmetic number, because the mean of its divisors is an integer number (2093116950).

Almost surely, 2^102111221010 is an apocalyptic number.

102111221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 102111221010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133959484800).

102111221010 is an abundant number, since it is smaller than the sum of its proper divisors (165807748590).

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

102111221010 is a wasteful number, since it uses less digits than its factorization.

102111221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54556.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 102111221010 its reverse (10122111201), we get a palindrome (112233332211).

The spelling of 102111221010 in words is "one hundred two billion, one hundred eleven million, two hundred twenty-one thousand, ten".