221020121210020 has 48 divisors (see below), whose sum is σ = 520021788890688. Its totient is φ = 78198765240960.

The previous prime is 221020121209967. The next prime is 221020121210023. The reversal of 221020121210020 is 20012121020122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221020121209976 and 221020121210003.

It is not an unprimeable number, because it can be changed into a prime (221020121210023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13576166382 + ... + 13576182661.

It is an arithmetic number, because the mean of its divisors is an integer number (10833787268556).

Almost surely, 2^{221020121210020} is an apocalyptic number.

221020121210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020121210020 is an abundant number, since it is smaller than the sum of its proper divisors (299001667680668).

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

221020121210020 is a wasteful number, since it uses less digits than its factorization.

221020121210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27152349100 (or 27152349098 counting only the distinct ones).

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

Adding to 221020121210020 its reverse (20012121020122), we get a palindrome (241032242230142).

The spelling of 221020121210020 in words is "two hundred twenty-one trillion, twenty billion, one hundred twenty-one million, two hundred ten thousand, twenty".