21230220202 has 4 divisors (see below), whose sum is σ = 31845330306. Its totient is φ = 10615110100.

The previous prime is 21230220199. The next prime is 21230220223. The reversal of 21230220202 is 20202203212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20218280481 + 1011939721 = 142191^2 + 31811^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307555049 + ... + 5307555052.

Almost surely, 2^21230220202 is an apocalyptic number.

21230220202 is a deficient number, since it is larger than the sum of its proper divisors (10615110104).

21230220202 is a wasteful number, since it uses less digits than its factorization.

21230220202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615110103.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21230220202 its reverse (20202203212), we get a palindrome (41432423414).

The spelling of 21230220202 in words is "twenty-one billion, two hundred thirty million, two hundred twenty thousand, two hundred two".