21022120202 has 8 divisors (see below), whose sum is σ = 33388073316. Its totient is φ = 9892762432.

The previous prime is 21022120183. The next prime is 21022120211. The reversal of 21022120202 is 20202122012.

It can be written as a sum of positive squares in 2 ways, for example, as 20938379401 + 83740801 = 144701^2 + 9151^2 .

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

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, 309148793 + ... + 309148860.

Almost surely, 2^21022120202 is an apocalyptic number.

21022120202 is a deficient number, since it is larger than the sum of its proper divisors (12365953114).

21022120202 is a wasteful number, since it uses less digits than its factorization.

21022120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618297672.

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

Adding to 21022120202 its reverse (20202122012), we get a palindrome (41224242214).

The spelling of 21022120202 in words is "twenty-one billion, twenty-two million, one hundred twenty thousand, two hundred two".