2102121120202 has 4 divisors (see below), whose sum is σ = 3153181680306. Its totient is φ = 1051060560100.

The previous prime is 2102121120161. The next prime is 2102121120233. The reversal of 2102121120202 is 2020211212012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2060255458881 + 41865661321 = 1435359^2 + 204611^2 .

It is a super-2 number, since 2×2102121120202² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525530280049 + ... + 525530280052.

Almost surely, 2^{2102121120202} is an apocalyptic number.

2102121120202 is a deficient number, since it is larger than the sum of its proper divisors (1051060560104).

2102121120202 is a wasteful number, since it uses less digits than its factorization.

2102121120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051060560103.

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

Adding to 2102121120202 its reverse (2020211212012), we get a palindrome (4122332332214).

The spelling of 2102121120202 in words is "two trillion, one hundred two billion, one hundred twenty-one million, one hundred twenty thousand, two hundred two".