20102121021002 has 4 divisors (see below), whose sum is σ = 30153181531506. Its totient is φ = 10051060510500.

The previous prime is 20102121020981. The next prime is 20102121021007. The reversal of 20102121021002 is 20012012120102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12113747991361 + 7988373029641 = 3480481^2 + 2826371^2 .

It is not an unprimeable number, because it can be changed into a prime (20102121021007) by changing a digit.

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 as a sum of consecutive naturals, namely, 5025530255249 + ... + 5025530255252.

Almost surely, 2^{20102121021002} is an apocalyptic number.

20102121021002 is a deficient number, since it is larger than the sum of its proper divisors (10051060510504).

20102121021002 is a wasteful number, since it uses less digits than its factorization.

20102121021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10051060510503.

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

Adding to 20102121021002 its reverse (20012012120102), we get a palindrome (40114133141104).

The spelling of 20102121021002 in words is "twenty trillion, one hundred two billion, one hundred twenty-one million, twenty-one thousand, two".