21021102120202 has 8 divisors (see below), whose sum is σ = 31532289933312. Its totient is φ = 10510338809100.

The previous prime is 21021102120149. The next prime is 21021102120203. The reversal of 21021102120202 is 20202120112012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21021102120202² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21021102120203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106001674 + ... + 106199797.

It is an arithmetic number, because the mean of its divisors is an integer number (3941536241664).

Almost surely, 2^{21021102120202} is an apocalyptic number.

21021102120202 is a deficient number, since it is larger than the sum of its proper divisors (10511187813110).

21021102120202 is a wasteful number, since it uses less digits than its factorization.

21021102120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212251004.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021102120202 its reverse (20202120112012), we get a palindrome (41223222232214).

The spelling of 21021102120202 in words is "twenty-one trillion, twenty-one billion, one hundred two million, one hundred twenty thousand, two hundred two".