221121100121020 has 24 divisors (see below), whose sum is σ = 506568338459568. Its totient is φ = 80407672771200.

The previous prime is 221121100120979. The next prime is 221121100121023. The reversal of 221121100121020 is 20121001121122.

It is a junction number, because it is equal to n+sod(n) for n = 221121100120985 and 221121100121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121100121023) 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, 502547954601 + ... + 502547955040.

It is an arithmetic number, because the mean of its divisors is an integer number (21107014102482).

Almost surely, 2^{221121100121020} is an apocalyptic number.

221121100121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121100121020 is an abundant number, since it is smaller than the sum of its proper divisors (285447238338548).

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

221121100121020 is a wasteful number, since it uses less digits than its factorization.

221121100121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005095909661 (or 1005095909659 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221121100121020 its reverse (20121001121122), we get a palindrome (241242101242142).

The spelling of 221121100121020 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, twenty".