21000121000102 has 4 divisors (see below), whose sum is σ = 31500181500156. Its totient is φ = 10500060500050.

The previous prime is 21000121000091. The next prime is 21000121000163. The reversal of 21000121000102 is 20100012100012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250030250024 + ... + 5250030250027.

It is an arithmetic number, because the mean of its divisors is an integer number (7875045375039).

Almost surely, 2^{21000121000102} is an apocalyptic number.

21000121000102 is a deficient number, since it is larger than the sum of its proper divisors (10500060500054).

21000121000102 is a wasteful number, since it uses less digits than its factorization.

21000121000102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500060500053.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000121000102 its reverse (20100012100012), we get a palindrome (41100133100114).

It can be divided in two parts, 2100012100010 and 2, that added together give a palindrome (2100012100012).

The spelling of 21000121000102 in words is "twenty-one trillion, one hundred twenty-one million, one hundred two", and thus it is an aban number.