2121222201021 has 32 divisors (see below), whose sum is σ = 3917986176000. Its totient is φ = 1101933609840.

The previous prime is 2121222201011. The next prime is 2121222201121. The reversal of 2121222201021 is 1201022221212.

It is a happy number.

It is not a de Polignac number, because 2121222201021 - 2⁵ = 2121222200989 is a prime.

It is a super-2 number, since 2×2121222201021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121222200985 and 2121222201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121222201001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 510152371 + ... + 510156528.

It is an arithmetic number, because the mean of its divisors is an integer number (122437068000).

Almost surely, 2^{2121222201021} is an apocalyptic number.

2121222201021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2121222201021 is a deficient number, since it is larger than the sum of its proper divisors (1796763974979).

2121222201021 is a wasteful number, since it uses less digits than its factorization.

2121222201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020308926 (or 1020308920 counting only the distinct ones).

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

Adding to 2121222201021 its reverse (1201022221212), we get a palindrome (3322244422233).

The spelling of 2121222201021 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred one thousand, twenty-one".