21101222011020 has 48 divisors (see below), whose sum is σ = 59085470260320. Its totient is φ = 5626797428736.

The previous prime is 21101222011019. The next prime is 21101222011063. The reversal of 21101222011020 is 2011022210112.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 4348117 + ... + 7817196.

It is an arithmetic number, because the mean of its divisors is an integer number (1230947297090).

Almost surely, 2^{21101222011020} is an apocalyptic number.

21101222011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101222011020 is an abundant number, since it is smaller than the sum of its proper divisors (37984248249300).

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

21101222011020 is a wasteful number, since it uses less digits than its factorization.

21101222011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12194234 (or 12194232 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21101222011020 its reverse (2011022210112), we get a palindrome (23112244221132).

The spelling of 21101222011020 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-two million, eleven thousand, twenty".