221021010010 has 32 divisors (see below), whose sum is σ = 399514254912. Its totient is φ = 88036085760.

The previous prime is 221021009971. The next prime is 221021010019. The reversal of 221021010010 is 10010120122.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (221021010019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9165429 + ... + 9189511.

It is an arithmetic number, because the mean of its divisors is an integer number (12484820466).

Almost surely, 2^221021010010 is an apocalyptic number.

221021010010 is a deficient number, since it is larger than the sum of its proper divisors (178493244902).

221021010010 is a wasteful number, since it uses less digits than its factorization.

221021010010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27918.

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

Adding to 221021010010 its reverse (10010120122), we get a palindrome (231031130132).

The spelling of 221021010010 in words is "two hundred twenty-one billion, twenty-one million, ten thousand, ten".