21110212222220 has 72 divisors (see below), whose sum is σ = 49038322682832. Its totient is φ = 7627546143360.

The previous prime is 21110212222219. The next prime is 21110212222261. The reversal of 21110212222220 is 2222221201112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21110212222192 and 21110212222201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27401042 + ... + 28160921.

Almost surely, 2^{21110212222220} is an apocalyptic number.

21110212222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110212222220 is an abundant number, since it is smaller than the sum of its proper divisors (27928110460612).

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

21110212222220 is a wasteful number, since it uses less digits than its factorization.

21110212222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55562151 (or 55562138 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21110212222220 its reverse (2222221201112), we get a palindrome (23332433423332).

The spelling of 21110212222220 in words is "twenty-one trillion, one hundred ten billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty".