21220002010 has 32 divisors (see below), whose sum is σ = 38662520832. Its totient is φ = 8384906880.

The previous prime is 21220001969. The next prime is 21220002019. The reversal of 21220002010 is 1020002212.

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 (21220002019) 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, 260055 + ... + 331765.

It is an arithmetic number, because the mean of its divisors is an integer number (1208203776).

Almost surely, 2^21220002010 is an apocalyptic number.

21220002010 is a deficient number, since it is larger than the sum of its proper divisors (17442518822).

21220002010 is a wasteful number, since it uses less digits than its factorization.

21220002010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72078.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21220002010 its reverse (1020002212), we get a palindrome (22240004222).

The spelling of 21220002010 in words is "twenty-one billion, two hundred twenty million, two thousand, ten".