101821212 has 30 divisors (see below), whose sum is σ = 266181608. Its totient is φ = 33940296.

The previous prime is 101821201. The next prime is 101821219. The reversal of 101821212 is 212128101.

It is a super-3 number, since 3×101821212³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101821219) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 156808 + ... + 157455.

Almost surely, 2^101821212 is an apocalyptic number.

101821212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

101821212 is an abundant number, since it is smaller than the sum of its proper divisors (164360396).

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

101821212 is a wasteful number, since it uses less digits than its factorization.

101821212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314279 (or 314268 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 101821212 is about 10090.6497313107. The cubic root of 101821212 is about 466.9597209199.

Adding to 101821212 its reverse (212128101), we get a palindrome (313949313).

The spelling of 101821212 in words is "one hundred one million, eight hundred twenty-one thousand, two hundred twelve".