10220121220021 has 8 divisors (see below), whose sum is σ = 10497212886744. Its totient is φ = 9943075457280.

The previous prime is 10220121219961. The next prime is 10220121220027. The reversal of 10220121220021 is 12002212102201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4135166987121 + 6084954232900 = 2033511^2 + 2466770^2 .

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 10220121220021 - 2⁴¹ = 8021097964469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10220121219977 and 10220121220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10220121220027) 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, 11024440 + ... + 11915473.

It is an arithmetic number, because the mean of its divisors is an integer number (1312151610843).

Almost surely, 2^{10220121220021} is an apocalyptic number.

It is an amenable number.

10220121220021 is a deficient number, since it is larger than the sum of its proper divisors (277091666723).

10220121220021 is a wasteful number, since it uses less digits than its factorization.

10220121220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22951991.

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

Adding to 10220121220021 its reverse (12002212102201), we get a palindrome (22222333322222).

The spelling of 10220121220021 in words is "ten trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty thousand, twenty-one".