221001121020220 has 48 divisors (see below), whose sum is σ = 466670279694528. Its totient is φ = 87911327738880.

The previous prime is 221001121020167. The next prime is 221001121020241. The reversal of 221001121020220 is 22020121100122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221001121020194 and 221001121020203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 764229297 + ... + 764518423.

It is an arithmetic number, because the mean of its divisors is an integer number (9722297493636).

Almost surely, 2^{221001121020220} is an apocalyptic number.

221001121020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001121020220 is an abundant number, since it is smaller than the sum of its proper divisors (245669158674308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221001121020220 is a wasteful number, since it uses less digits than its factorization.

221001121020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500470 (or 500468 counting only the distinct ones).

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

Adding to 221001121020220 its reverse (22020121100122), we get a palindrome (243021242120342).

The spelling of 221001121020220 in words is "two hundred twenty-one trillion, one billion, one hundred twenty-one million, twenty thousand, two hundred twenty".