102121020021 has 8 divisors (see below), whose sum is σ = 136565401024. Its totient is φ = 67878659520.

The previous prime is 102121020019. The next prime is 102121020151. The reversal of 102121020021 is 120020121201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102121020021 - 2¹ = 102121020019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102121019979 and 102121020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121021021) 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, 50503945 + ... + 50505966.

It is an arithmetic number, because the mean of its divisors is an integer number (17070675128).

Almost surely, 2^102121020021 is an apocalyptic number.

It is an amenable number.

102121020021 is a deficient number, since it is larger than the sum of its proper divisors (34444381003).

102121020021 is a wasteful number, since it uses less digits than its factorization.

102121020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101010251.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 102121020021 its reverse (120020121201), we get a palindrome (222141141222).

The spelling of 102121020021 in words is "one hundred two billion, one hundred twenty-one million, twenty thousand, twenty-one".