21010221010 has 32 divisors (see below), whose sum is σ = 39635101440. Its totient is φ = 8003569728.

The previous prime is 21010220999. The next prime is 21010221053. The reversal of 21010221010 is 1012201012.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146782 + ... + 252121.

It is an arithmetic number, because the mean of its divisors is an integer number (1238596920).

Almost surely, 2^21010221010 is an apocalyptic number.

21010221010 is a deficient number, since it is larger than the sum of its proper divisors (18624880430).

21010221010 is a wasteful number, since it uses less digits than its factorization.

21010221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399162.

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

Adding to 21010221010 its reverse (1012201012), we get a palindrome (22022422022).

The spelling of 21010221010 in words is "twenty-one billion, ten million, two hundred twenty-one thousand, ten".