2121022420 has 24 divisors (see below), whose sum is σ = 4859070048. Its totient is φ = 771280800.

The previous prime is 2121022369. The next prime is 2121022471. The reversal of 2121022420 is 242201212.

It is an interprime number because it is at equal distance from previous prime (2121022369) and next prime (2121022471).

It is a super-2 number, since 2×2121022420² = 8997472212285312800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121022394 and 2121022403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4820286 + ... + 4820725.

It is an arithmetic number, because the mean of its divisors is an integer number (202461252).

Almost surely, 2^2121022420 is an apocalyptic number.

2121022420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121022420 is an abundant number, since it is smaller than the sum of its proper divisors (2738047628).

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

2121022420 is a wasteful number, since it uses less digits than its factorization.

2121022420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9641031 (or 9641029 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2121022420 is about 46054.5591662758. The cubic root of 2121022420 is about 1284.8381391608.

Adding to 2121022420 its reverse (242201212), we get a palindrome (2363223632).

The spelling of 2121022420 in words is "two billion, one hundred twenty-one million, twenty-two thousand, four hundred twenty".