101221312 has 28 divisors (see below), whose sum is σ = 205537816. Its totient is φ = 49432320.

The previous prime is 101221297. The next prime is 101221313. The reversal of 101221312 is 213122101.

It is a junction number, because it is equal to n+sod(n) for n = 101221292 and 101221301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15639 + ... + 21142.

Almost surely, 2^101221312 is an apocalyptic number.

It is an amenable number.

101221312 is an abundant number, since it is smaller than the sum of its proper divisors (104316504).

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

101221312 is an equidigital number, since it uses as much as digits as its factorization.

101221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36836 (or 36826 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 101221312 is about 10060.8802795779. The cubic root of 101221312 is about 466.0408518405.

Adding to 101221312 its reverse (213122101), we get a palindrome (314343413).

The spelling of 101221312 in words is "one hundred one million, two hundred twenty-one thousand, three hundred twelve".