121101210010021 has 8 divisors (see below), whose sum is σ = 125279627020920. Its totient is φ = 116922960547008.

The previous prime is 121101210010019. The next prime is 121101210010057. The reversal of 121101210010021 is 120010012101121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1530265487521 + 119570944522500 = 1237039^2 + 10934850^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121101210010021 - 2¹ = 121101210010019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121101210009983 and 121101210010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101210010321) 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, 40415586 + ... + 43308451.

It is an arithmetic number, because the mean of its divisors is an integer number (15659953377615).

Almost surely, 2^{121101210010021} is an apocalyptic number.

It is an amenable number.

121101210010021 is a deficient number, since it is larger than the sum of its proper divisors (4178417010899).

121101210010021 is an equidigital number, since it uses as much as digits as its factorization.

121101210010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83773943.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121101210010021 its reverse (120010012101121), we get a palindrome (241111222111142).

The spelling of 121101210010021 in words is "one hundred twenty-one trillion, one hundred one billion, two hundred ten million, ten thousand, twenty-one".