21020012110220 has 24 divisors (see below), whose sum is σ = 44438280642000. Its totient is φ = 8351575280192.

The previous prime is 21020012110189. The next prime is 21020012110231. The reversal of 21020012110220 is 2201121002012.

It is a super-2 number, since 2×21020012110220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020012110195 and 21020012110204.

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, 3526844690 + ... + 3526850649.

It is an arithmetic number, because the mean of its divisors is an integer number (1851595026750).

Almost surely, 2^{21020012110220} is an apocalyptic number.

21020012110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020012110220 is an abundant number, since it is smaller than the sum of its proper divisors (23418268531780).

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

21020012110220 is a wasteful number, since it uses less digits than its factorization.

21020012110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7053695497 (or 7053695495 counting only the distinct ones).

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

Adding to 21020012110220 its reverse (2201121002012), we get a palindrome (23221133112232).

The spelling of 21020012110220 in words is "twenty-one trillion, twenty billion, twelve million, one hundred ten thousand, two hundred twenty".