21020222021 has 8 divisors (see below), whose sum is σ = 21278921664. Its totient is φ = 20761652160.

The previous prime is 21020221997. The next prime is 21020222029. The reversal of 21020222021 is 12022202012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020222021 is a prime.

It is a super-3 number, since 3×21020222021³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020221987 and 21020222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020222029) 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, 316376 + ... + 377006.

It is an arithmetic number, because the mean of its divisors is an integer number (2659865208).

Almost surely, 2^21020222021 is an apocalyptic number.

It is an amenable number.

21020222021 is a deficient number, since it is larger than the sum of its proper divisors (258699643).

21020222021 is an equidigital number, since it uses as much as digits as its factorization.

21020222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64891.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21020222021 its reverse (12022202012), we get a palindrome (33042424033).

The spelling of 21020222021 in words is "twenty-one billion, twenty million, two hundred twenty-two thousand, twenty-one".