21115120202 has 16 divisors (see below), whose sum is σ = 34613406432. Its totient is φ = 9580728720.

The previous prime is 21115120199. The next prime is 21115120207. The reversal of 21115120202 is 20202151112.

It is a super-2 number, since 2×21115120202² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21115120207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 839993 + ... + 864764.

It is an arithmetic number, because the mean of its divisors is an integer number (2163337902).

Almost surely, 2^21115120202 is an apocalyptic number.

21115120202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21115120202 is a deficient number, since it is larger than the sum of its proper divisors (13498286230).

21115120202 is a wasteful number, since it uses less digits than its factorization.

21115120202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705333.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21115120202 its reverse (20202151112), we get a palindrome (41317271314).

The spelling of 21115120202 in words is "twenty-one billion, one hundred fifteen million, one hundred twenty thousand, two hundred two".