21121100220002 has 8 divisors (see below), whose sum is σ = 31685504101212. Its totient is φ = 10559265519600.

The previous prime is 21121100219953. The next prime is 21121100220013. The reversal of 21121100220002 is 20002200112112.

It can be written as a sum of positive squares in 2 ways, for example, as 13144039971841 + 7977060248161 = 3625471^2 + 2824369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21121100220002² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642274649 + ... + 642307532.

Almost surely, 2^{21121100220002} is an apocalyptic number.

21121100220002 is a deficient number, since it is larger than the sum of its proper divisors (10564403881210).

21121100220002 is a wasteful number, since it uses less digits than its factorization.

21121100220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284590404.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21121100220002 its reverse (20002200112112), we get a palindrome (41123300332114).

The spelling of 21121100220002 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, two hundred twenty thousand, two".