21012100202 has 16 divisors (see below), whose sum is σ = 32891892480. Its totient is φ = 10048230192.

The previous prime is 21012100201. The next prime is 21012100211. The reversal of 21012100202 is 20200121012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21012100201) 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, 613199 + ... + 646557.

It is an arithmetic number, because the mean of its divisors is an integer number (2055743280).

Almost surely, 2^21012100202 is an apocalyptic number.

21012100202 is a deficient number, since it is larger than the sum of its proper divisors (11879792278).

21012100202 is a wasteful number, since it uses less digits than its factorization.

21012100202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47077.

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

Adding to 21012100202 its reverse (20200121012), we get a palindrome (41212221214).

The spelling of 21012100202 in words is "twenty-one billion, twelve million, one hundred thousand, two hundred two".