21020021111201 has 16 divisors (see below), whose sum is σ = 24090583968000. Its totient is φ = 17966387210688.

The previous prime is 21020021111179. The next prime is 21020021111231. The reversal of 21020021111201 is 10211112002012.

It is not a de Polignac number, because 21020021111201 - 2²² = 21020016916897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020021111231) 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, 88210451 + ... + 88448423.

It is an arithmetic number, because the mean of its divisors is an integer number (1505661498000).

Almost surely, 2^{21020021111201} is an apocalyptic number.

It is an amenable number.

21020021111201 is a deficient number, since it is larger than the sum of its proper divisors (3070562856799).

21020021111201 is a wasteful number, since it uses less digits than its factorization.

21020021111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273488.

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

Adding to 21020021111201 its reverse (10211112002012), we get a palindrome (31231133113213).

The spelling of 21020021111201 in words is "twenty-one trillion, twenty billion, twenty-one million, one hundred eleven thousand, two hundred one".