21011203202 has 32 divisors (see below), whose sum is σ = 35889381504. Its totient is φ = 9132112000.

The previous prime is 21011203201. The next prime is 21011203207. The reversal of 21011203202 is 20230211012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21011203201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1976702 + ... + 1987302.

It is an arithmetic number, because the mean of its divisors is an integer number (1121543172).

Almost surely, 2^21011203202 is an apocalyptic number.

21011203202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21011203202 is a deficient number, since it is larger than the sum of its proper divisors (14878178302).

21011203202 is a wasteful number, since it uses less digits than its factorization.

21011203202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14554.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21011203202 its reverse (20230211012), we get a palindrome (41241414214).

The spelling of 21011203202 in words is "twenty-one billion, eleven million, two hundred three thousand, two hundred two".