21120101021220 has 48 divisors (see below), whose sum is σ = 59466653184960. Its totient is φ = 5600563098496.

The previous prime is 21120101021213. The next prime is 21120101021233. The reversal of 21120101021220 is 2212010102112.

It is a super-3 number, since 3×21120101021220³ (a number of 41 digits) contains 333 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21120101021220.

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, 983234187 + ... + 983255666.

It is an arithmetic number, because the mean of its divisors is an integer number (1238888608020).

Almost surely, 2^{21120101021220} is an apocalyptic number.

21120101021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120101021220 is an abundant number, since it is smaller than the sum of its proper divisors (38346552163740).

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

21120101021220 is a wasteful number, since it uses less digits than its factorization.

21120101021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966490044 (or 1966490042 counting only the distinct ones).

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

Adding to 21120101021220 its reverse (2212010102112), we get a palindrome (23332111123332).

The spelling of 21120101021220 in words is "twenty-one trillion, one hundred twenty billion, one hundred one million, twenty-one thousand, two hundred twenty".