220121212020021 has 64 divisors (see below), whose sum is σ = 371855632861440. Its totient is φ = 127488677621760.

The previous prime is 220121212019957. The next prime is 220121212020053. The reversal of 220121212020021 is 120020212121022.

It is a happy number.

220121212020021 is a `hidden beast` number, since 220 + 1 + 212 + 12 + 0 + 200 + 21 = 666.

220121212020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220121212020021 - 2⁶ = 220121212019957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220121212019976 and 220121212020003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121212020821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 356058301 + ... + 356675981.

It is an arithmetic number, because the mean of its divisors is an integer number (5810244263460).

Almost surely, 2^{220121212020021} is an apocalyptic number.

It is an amenable number.

220121212020021 is a deficient number, since it is larger than the sum of its proper divisors (151734420841419).

220121212020021 is a wasteful number, since it uses less digits than its factorization.

220121212020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677443 (or 677437 counting only the distinct ones).

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

Adding to 220121212020021 its reverse (120020212121022), we get a palindrome (340141424141043).

The spelling of 220121212020021 in words is "two hundred twenty trillion, one hundred twenty-one billion, two hundred twelve million, twenty thousand, twenty-one".