101121210 has 80 divisors (see below), whose sum is σ = 274323456. Its totient is φ = 26726112.

The previous prime is 101121203. The next prime is 101121247. The reversal of 101121210 is 12121101.

It is a happy number.

It is a super-2 number, since 2×101121210² = 20450998223728200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 101121192 and 101121201.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 102379 + ... + 103361.

Almost surely, 2^101121210 is an apocalyptic number.

101121210 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 101121210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137161728).

101121210 is an abundant number, since it is smaller than the sum of its proper divisors (173202246).

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

101121210 is a wasteful number, since it uses less digits than its factorization.

101121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 101121210 is about 10055.9042358209. The cubic root of 101121210 is about 465.8871720556.

Adding to 101121210 its reverse (12121101), we get a palindrome (113242311).

The spelling of 101121210 in words is "one hundred one million, one hundred twenty-one thousand, two hundred ten".