20010210111221 has 16 divisors (see below), whose sum is σ = 23430019678848. Its totient is φ = 16886500646400.

The previous prime is 20010210111209. The next prime is 20010210111239. The reversal of 20010210111221 is 12211101201002.

It is not a de Polignac number, because 20010210111221 - 2²² = 20010205916917 is a prime.

It is a super-2 number, since 2×20010210111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010210111196 and 20010210111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010210111251) 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, 732907385 + ... + 732934686.

It is an arithmetic number, because the mean of its divisors is an integer number (1464376229928).

Almost surely, 2^{20010210111221} is an apocalyptic number.

It is an amenable number.

20010210111221 is a deficient number, since it is larger than the sum of its proper divisors (3419809567627).

20010210111221 is a wasteful number, since it uses less digits than its factorization.

20010210111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465842172.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20010210111221 its reverse (12211101201002), we get a palindrome (32221311312223).

The spelling of 20010210111221 in words is "twenty trillion, ten billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".