102020121222221 has 4 divisors (see below), whose sum is σ = 103030221432444. Its totient is φ = 101010021012000.

The previous prime is 102020121222209. The next prime is 102020121222241. The reversal of 102020121222221 is 122222121020201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44939995912900 + 57080125309321 = 6703730^2 + 7555139^2 .

It is a cyclic number.

It is not a de Polignac number, because 102020121222221 - 2¹⁴ = 102020121205837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102020121222193 and 102020121222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102020121222241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505050104960 + ... + 505050105161.

It is an arithmetic number, because the mean of its divisors is an integer number (25757555358111).

Almost surely, 2^{102020121222221} is an apocalyptic number.

It is an amenable number.

102020121222221 is a deficient number, since it is larger than the sum of its proper divisors (1010100210223).

102020121222221 is a wasteful number, since it uses less digits than its factorization.

102020121222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010100210222.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 102020121222221 its reverse (122222121020201), we get a palindrome (224242242242422).

The spelling of 102020121222221 in words is "one hundred two trillion, twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".