101221100010 has 80 divisors (see below), whose sum is σ = 278501975136. Its totient is φ = 26364556512.

The previous prime is 101221099999. The next prime is 101221100027. The reversal of 101221100010 is 10001122101.

It is a happy number.

It is a super-2 number, since 2×101221100010² (a number of 23 digits) 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 = 101221099965 and 101221100001.

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, 1418244 + ... + 1487903.

Almost surely, 2^101221100010 is an apocalyptic number.

101221100010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101221100010 is an abundant number, since it is smaller than the sum of its proper divisors (177280875126).

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

101221100010 is a wasteful number, since it uses less digits than its factorization.

101221100010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906209 (or 2906200 counting only the distinct ones).

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

Adding to 101221100010 its reverse (10001122101), we get a palindrome (111222222111).

The spelling of 101221100010 in words is "one hundred one billion, two hundred twenty-one million, one hundred thousand, ten".