2121221202102 has 16 divisors (see below), whose sum is σ = 4713824893680. Its totient is φ = 707073734016.

The previous prime is 2121221202091. The next prime is 2121221202103. The reversal of 2121221202102 is 2012021221212.

It is a happy number.

2121221202102 is a `hidden beast` number, since 212 + 1 + 221 + 20 + 210 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221202103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19640937003 + ... + 19640937110.

It is an arithmetic number, because the mean of its divisors is an integer number (294614055855).

Almost surely, 2^{2121221202102} is an apocalyptic number.

2121221202102 is an abundant number, since it is smaller than the sum of its proper divisors (2592603691578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121221202102 is a wasteful number, since it uses less digits than its factorization.

2121221202102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39281874124 (or 39281874118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2121221202102 its reverse (2012021221212), we get a palindrome (4133242423314).

The spelling of 2121221202102 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred two".