21002110202122 has 8 divisors (see below), whose sum is σ = 36003617489376. Its totient is φ = 9000904372332.

The previous prime is 21002110202107. The next prime is 21002110202123. The reversal of 21002110202122 is 22120201120012.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21002110202096 and 21002110202105.

It is not an unprimeable number, because it can be changed into a prime (21002110202123) 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, 750075364348 + ... + 750075364375.

It is an arithmetic number, because the mean of its divisors is an integer number (4500452186172).

Almost surely, 2^{21002110202122} is an apocalyptic number.

21002110202122 is a deficient number, since it is larger than the sum of its proper divisors (15001507287254).

21002110202122 is a wasteful number, since it uses less digits than its factorization.

21002110202122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500150728732.

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

Adding to 21002110202122 its reverse (22120201120012), we get a palindrome (43122311322134).

The spelling of 21002110202122 in words is "twenty-one trillion, two billion, one hundred ten million, two hundred two thousand, one hundred twenty-two".