21000102202121 has 12 divisors (see below), whose sum is σ = 24656995839888. Its totient is φ = 17831862479592.

The previous prime is 21000102202109. The next prime is 21000102202141. The reversal of 21000102202121 is 12120220100012.

It is a de Polignac number, because none of the positive numbers 2^k-21000102202121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000102202096 and 21000102202105.

It is not an unprimeable number, because it can be changed into a prime (21000102202141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2002674731 + ... + 2002685216.

It is an arithmetic number, because the mean of its divisors is an integer number (2054749653324).

Almost surely, 2^{21000102202121} is an apocalyptic number.

It is an amenable number.

21000102202121 is a deficient number, since it is larger than the sum of its proper divisors (3656893637767).

21000102202121 is a wasteful number, since it uses less digits than its factorization.

21000102202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4005360068 (or 4005360061 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000102202121 its reverse (12120220100012), we get a palindrome (33120322302133).

The spelling of 21000102202121 in words is "twenty-one trillion, one hundred two million, two hundred two thousand, one hundred twenty-one".