21120121002002 has 12 divisors (see below), whose sum is σ = 34822017685518. Its totient is φ = 9600055000800.

The previous prime is 21120121001933. The next prime is 21120121002107. The reversal of 21120121002002 is 20020012102112.

It can be written as a sum of positive squares in only one way, i.e., 19985361309001 + 1134759693001 = 4470499^2 + 1065251^2 .

It is a super-2 number, since 2×21120121002002² (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 5 ways as a sum of consecutive naturals, for example, 43636613399 + ... + 43636613882.

Almost surely, 2^{21120121002002} is an apocalyptic number.

21120121002002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21120121002002 is a deficient number, since it is larger than the sum of its proper divisors (13701896683516).

21120121002002 is a wasteful number, since it uses less digits than its factorization.

21120121002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87273227305 (or 87273227294 counting only the distinct ones).

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

Adding to 21120121002002 its reverse (20020012102112), we get a palindrome (41140133104114).

The spelling of 21120121002002 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-one million, two thousand, two".