21220121002010 has 32 divisors (see below), whose sum is σ = 45950337210240. Its totient is φ = 6892550580672.

The previous prime is 21220121002009. The next prime is 21220121002019. The reversal of 21220121002010 is 1020012102212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21220121002019) 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, 7977487769 + ... + 7977490428.

It is an arithmetic number, because the mean of its divisors is an integer number (1435948037820).

Almost surely, 2^{21220121002010} is an apocalyptic number.

21220121002010 is an abundant number, since it is smaller than the sum of its proper divisors (24730216208230).

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

21220121002010 is a wasteful number, since it uses less digits than its factorization.

21220121002010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15954978230.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220121002010 its reverse (1020012102212), we get a palindrome (22240133104222).

The spelling of 21220121002010 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two thousand, ten".