21211212002121 has 160 divisors (see below), whose sum is σ = 34252320136320. Its totient is φ = 13040818560000.

The previous prime is 21211212002093. The next prime is 21211212002171. The reversal of 21211212002121 is 12120021211212.

21211212002121 is a `hidden beast` number, since 21 + 211 + 21 + 200 + 212 + 1 = 666.

It is not a de Polignac number, because 21211212002121 - 2¹¹ = 21211212000073 is a prime.

It is a super-2 number, since 2×21211212002121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211212002094 and 21211212002103.

It is not an unprimeable number, because it can be changed into a prime (21211212002171) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 6425691171 + ... + 6425694471.

It is an arithmetic number, because the mean of its divisors is an integer number (214077000852).

Almost surely, 2^{21211212002121} is an apocalyptic number.

It is an amenable number.

21211212002121 is a deficient number, since it is larger than the sum of its proper divisors (13041108134199).

21211212002121 is a wasteful number, since it uses less digits than its factorization.

21211212002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4117 (or 4108 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21211212002121 its reverse (12120021211212), we get a palindrome (33331233213333).

The spelling of 21211212002121 in words is "twenty-one trillion, two hundred eleven billion, two hundred twelve million, two thousand, one hundred twenty-one".