101221012 has 12 divisors (see below), whose sum is σ = 177430036. Its totient is φ = 50526720.

The previous prime is 101220971. The next prime is 101221019. The reversal of 101221012 is 210122101.

It can be written as a sum of positive squares in 2 ways, for example, as 14470416 + 86750596 = 3804^2 + 9314^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 101221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221019) 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, 18189 + ... + 23092.

Almost surely, 2^101221012 is an apocalyptic number.

It is an amenable number.

101221012 is a deficient number, since it is larger than the sum of its proper divisors (76209024).

101221012 is a wasteful number, since it uses less digits than its factorization.

101221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41898 (or 41896 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 101221012 is about 10060.8653703347. The cubic root of 101221012 is about 466.0403914224.

Adding to 101221012 its reverse (210122101), we get a palindrome (311343113).

It can be divided in two parts, 10122101 and 2, that multiplied together give a palindrome (20244202).

The spelling of 101221012 in words is "one hundred one million, two hundred twenty-one thousand, twelve".