21021020222 has 8 divisors (see below), whose sum is σ = 31535558976. Its totient is φ = 10509167232.

The previous prime is 21021020161. The next prime is 21021020239. The reversal of 21021020222 is 22202012012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21021020197 and 21021020206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651758 + ... + 683249.

It is an arithmetic number, because the mean of its divisors is an integer number (3941944872).

Almost surely, 2^21021020222 is an apocalyptic number.

21021020222 is a deficient number, since it is larger than the sum of its proper divisors (10514538754).

21021020222 is a wasteful number, since it uses less digits than its factorization.

21021020222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342882.

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

Adding to 21021020222 its reverse (22202012012), we get a palindrome (43223032234).

The spelling of 21021020222 in words is "twenty-one billion, twenty-one million, twenty thousand, two hundred twenty-two".