102211220 has 12 divisors (see below), whose sum is σ = 214643604. Its totient is φ = 40884480.

The previous prime is 102211217. The next prime is 102211231. The reversal of 102211220 is 22112201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76282756 + 25928464 = 8734^2 + 5092^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2555261 + ... + 2555300.

It is an arithmetic number, because the mean of its divisors is an integer number (17886967).

Almost surely, 2^102211220 is an apocalyptic number.

102211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102211220 is an abundant number, since it is smaller than the sum of its proper divisors (112432384).

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

102211220 is a wasteful number, since it uses less digits than its factorization.

102211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5110570 (or 5110568 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 102211220 is about 10109.9564786403. The cubic root of 102211220 is about 467.5551633077. Note that the first 3 decimals are identical.

Adding to 102211220 its reverse (22112201), we get a palindrome (124323421).

The spelling of 102211220 in words is "one hundred two million, two hundred eleven thousand, two hundred twenty".