221101221020 has 24 divisors (see below), whose sum is σ = 466996459104. Its totient is φ = 87929270336.

The previous prime is 221101221017. The next prime is 221101221031. The reversal of 221101221020 is 20122101122.

It is a junction number, because it is equal to n+sod(n) for n = 221101220986 and 221101221004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31947584 + ... + 31954503.

It is an arithmetic number, because the mean of its divisors is an integer number (19458185796).

Almost surely, 2^221101221020 is an apocalyptic number.

221101221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221101221020 is an abundant number, since it is smaller than the sum of its proper divisors (245895238084).

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

221101221020 is a wasteful number, since it uses less digits than its factorization.

221101221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63902269 (or 63902267 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221101221020 its reverse (20122101122), we get a palindrome (241223322142).

The spelling of 221101221020 in words is "two hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, twenty".