21120100202 has 4 divisors (see below), whose sum is σ = 31680150306. Its totient is φ = 10560050100.

The previous prime is 21120100189. The next prime is 21120100217. The reversal of 21120100202 is 20200102112.

It is a happy number.

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., 21118193041 + 1907161 = 145321^2 + 1381^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280025049 + ... + 5280025052.

Almost surely, 2^21120100202 is an apocalyptic number.

21120100202 is a deficient number, since it is larger than the sum of its proper divisors (10560050104).

21120100202 is a wasteful number, since it uses less digits than its factorization.

21120100202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560050103.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21120100202 its reverse (20200102112), we get a palindrome (41320202314).

The spelling of 21120100202 in words is "twenty-one billion, one hundred twenty million, one hundred thousand, two hundred two".