21202121100212 has 24 divisors (see below), whose sum is σ = 39958903539072. Its totient is φ = 9785334780000.

The previous prime is 21202121100187. The next prime is 21202121100221. The reversal of 21202121100212 is 21200112120212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3421664 + ... + 7356087.

It is an arithmetic number, because the mean of its divisors is an integer number (1664954314128).

Almost surely, 2^{21202121100212} is an apocalyptic number.

It is an amenable number.

21202121100212 is a deficient number, since it is larger than the sum of its proper divisors (18756782438860).

21202121100212 is a wasteful number, since it uses less digits than its factorization.

21202121100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10815599 (or 10815597 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21202121100212 its reverse (21200112120212), we get a palindrome (42402233220424).

The spelling of 21202121100212 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-one million, one hundred thousand, two hundred twelve".