21120221202220 has 48 divisors (see below), whose sum is σ = 51330157885440. Its totient is φ = 7149557697984.

The previous prime is 21120221202211. The next prime is 21120221202233. The reversal of 21120221202220 is 2220212202112.

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, 954790984 + ... + 954813103.

It is an arithmetic number, because the mean of its divisors is an integer number (1069378289280).

Almost surely, 2^{21120221202220} is an apocalyptic number.

21120221202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120221202220 is an abundant number, since it is smaller than the sum of its proper divisors (30209936683220).

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

21120221202220 is a wasteful number, since it uses less digits than its factorization.

21120221202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909604182 (or 1909604180 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21120221202220 its reverse (2220212202112), we get a palindrome (23340433404332).

The spelling of 21120221202220 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, two hundred two thousand, two hundred twenty".