21011000122220 has 24 divisors (see below), whose sum is σ = 46718576743104. Its totient is φ = 7910023575296.

The previous prime is 21011000122187. The next prime is 21011000122223. The reversal of 21011000122220 is 2222100011012.

It is a super-2 number, since 2×21011000122220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011000122195 and 21011000122204.

It is not an unprimeable number, because it can be changed into a prime (21011000122223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30898529252 + ... + 30898529931.

It is an arithmetic number, because the mean of its divisors is an integer number (1946607364296).

Almost surely, 2^{21011000122220} is an apocalyptic number.

21011000122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011000122220 is an abundant number, since it is smaller than the sum of its proper divisors (25707576620884).

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

21011000122220 is a wasteful number, since it uses less digits than its factorization.

21011000122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61797059209 (or 61797059207 counting only the distinct ones).

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

Adding to 21011000122220 its reverse (2222100011012), we get a palindrome (23233100133232).

The spelling of 21011000122220 in words is "twenty-one trillion, eleven billion, one hundred twenty-two thousand, two hundred twenty".