21022012211220 has 48 divisors (see below), whose sum is σ = 65401815769920. Its totient is φ = 5605869922848.

The previous prime is 21022012211197. The next prime is 21022012211243. The reversal of 21022012211220 is 2211221022012.

It is a happy number.

21022012211220 is a `hidden beast` number, since 2 + 1 + 0 + 220 + 1 + 221 + 1 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (21022012211197) and next prime (21022012211243).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21022012211193 and 21022012211202.

It is a congruent number.

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, 19464825582 + ... + 19464826661.

It is an arithmetic number, because the mean of its divisors is an integer number (1362537828540).

Almost surely, 2^{21022012211220} is an apocalyptic number.

21022012211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022012211220 is an abundant number, since it is smaller than the sum of its proper divisors (44379803558700).

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

21022012211220 is a wasteful number, since it uses less digits than its factorization.

21022012211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38929652261 (or 38929652253 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21022012211220 its reverse (2211221022012), we get a palindrome (23233233233232).

The spelling of 21022012211220 in words is "twenty-one trillion, twenty-two billion, twelve million, two hundred eleven thousand, two hundred twenty".