102120222120021 has 192 divisors, whose sum is σ = 179899853672448. Its totient is φ = 54492168167424.

The previous prime is 102120222120013. The next prime is 102120222120023. The reversal of 102120222120021 is 120021222021201.

It is a happy number.

102120222120021 is a `hidden beast` number, since 1 + 0 + 21 + 202 + 221 + 200 + 21 = 666.

It is not a de Polignac number, because 102120222120021 - 2³ = 102120222120013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102120222119976 and 102120222120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120222120023) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 118331659036 + ... + 118331659898.

It is an arithmetic number, because the mean of its divisors is an integer number (936978404544).

Almost surely, 2^{102120222120021} is an apocalyptic number.

It is an amenable number.

102120222120021 is a deficient number, since it is larger than the sum of its proper divisors (77779631552427).

102120222120021 is a wasteful number, since it uses less digits than its factorization.

102120222120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420 (or 2417 counting only the distinct ones).

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

Adding to 102120222120021 its reverse (120021222021201), we get a palindrome (222141444141222).

The spelling of 102120222120021 in words is "one hundred two trillion, one hundred twenty billion, two hundred twenty-two million, one hundred twenty thousand, twenty-one".