221020100010 has 80 divisors (see below), whose sum is σ = 604371477600. Its totient is φ = 57939719904.

The previous prime is 221020100009. The next prime is 221020100023. The reversal of 221020100010 is 10001020122.

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 = 221020099965 and 221020100001.

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, 2264620 + ... + 2360199.

It is an arithmetic number, because the mean of its divisors is an integer number (7554643470).

Almost surely, 2^221020100010 is an apocalyptic number.

221020100010 is an abundant number, since it is smaller than the sum of its proper divisors (383351377590).

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

221020100010 is a wasteful number, since it uses less digits than its factorization.

221020100010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624897 (or 4624888 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 221020100010 its reverse (10001020122), we get a palindrome (231021120132).

The spelling of 221020100010 in words is "two hundred twenty-one billion, twenty million, one hundred thousand, ten".