102221690 has 8 divisors (see below), whose sum is σ = 183999060. Its totient is φ = 40888672.

The previous prime is 102221687. The next prime is 102221711. The reversal of 102221690 is 96122201.

It can be written as a sum of positive squares in 2 ways, for example, as 98585041 + 3636649 = 9929^2 + 1907^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×102221690³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon 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, 5111075 + ... + 5111094.

Almost surely, 2^102221690 is an apocalyptic number.

102221690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102221690 is a deficient number, since it is larger than the sum of its proper divisors (81777370).

102221690 is a wasteful number, since it uses less digits than its factorization.

102221690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10222176.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 102221690 is about 10110.4742717639. The cubic root of 102221690 is about 467.5711274241.

Adding to 102221690 its reverse (96122201), we get a palindrome (198343891).

The spelling of 102221690 in words is "one hundred two million, two hundred twenty-one thousand, six hundred ninety".