20211021110021 has 48 divisors (see below), whose sum is σ = 24892349975424. Its totient is φ = 16068961294848.

The previous prime is 20211021110017. The next prime is 20211021110051. The reversal of 20211021110021 is 12001112011202.

It is not a de Polignac number, because 20211021110021 - 2² = 20211021110017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211021109978 and 20211021110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211021110011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24872666 + ... + 25672388.

It is an arithmetic number, because the mean of its divisors is an integer number (518590624488).

Almost surely, 2^{20211021110021} is an apocalyptic number.

It is an amenable number.

20211021110021 is a deficient number, since it is larger than the sum of its proper divisors (4681328865403).

20211021110021 is a wasteful number, since it uses less digits than its factorization.

20211021110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799978 (or 799959 counting only the distinct ones).

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

Adding to 20211021110021 its reverse (12001112011202), we get a palindrome (32212133121223).

The spelling of 20211021110021 in words is "twenty trillion, two hundred eleven billion, twenty-one million, one hundred ten thousand, twenty-one".