2121022211220 has 144 divisors (see below), whose sum is σ = 7019084584512. Its totient is φ = 514155755520.

The previous prime is 2121022211197. The next prime is 2121022211233. The reversal of 2121022211220 is 221122201212.

It is a happy number.

2121022211220 is a `hidden beast` number, since 2 + 1 + 210 + 22 + 211 + 220 = 666.

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 = 2121022211193 and 2121022211202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62141079 + ... + 62175201.

It is an arithmetic number, because the mean of its divisors is an integer number (48743642948).

Almost surely, 2^{2121022211220} is an apocalyptic number.

2121022211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121022211220 is an abundant number, since it is smaller than the sum of its proper divisors (4898062373292).

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

2121022211220 is a wasteful number, since it uses less digits than its factorization.

2121022211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65542 (or 65537 counting only the distinct ones).

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

Adding to 2121022211220 its reverse (221122201212), we get a palindrome (2342144412432).

The spelling of 2121022211220 in words is "two trillion, one hundred twenty-one billion, twenty-two million, two hundred eleven thousand, two hundred twenty".