21020021120231 has 8 divisors (see below), whose sum is σ = 24025166428704. Its totient is φ = 18015447098880.

The previous prime is 21020021120209. The next prime is 21020021120257. The reversal of 21020021120231 is 13202112002012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21020021120231 - 2¹⁸ = 21020020858087 is a prime.

It is a super-2 number, since 2×21020021120231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020021126231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142742930 + ... + 142890111.

It is an arithmetic number, because the mean of its divisors is an integer number (3003145803588).

Almost surely, 2^{21020021120231} is an apocalyptic number.

21020021120231 is a deficient number, since it is larger than the sum of its proper divisors (3005145308473).

21020021120231 is a wasteful number, since it uses less digits than its factorization.

21020021120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285643561.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21020021120231 its reverse (13202112002012), we get a palindrome (34222133122243).

The spelling of 21020021120231 in words is "twenty-one trillion, twenty billion, twenty-one million, one hundred twenty thousand, two hundred thirty-one".