21000212000102 has 4 divisors (see below), whose sum is σ = 31500318000156. Its totient is φ = 10500106000050.

The previous prime is 21000212000077. The next prime is 21000212000177. The reversal of 21000212000102 is 20100021200012.

It is a happy number.

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, 5250053000024 + ... + 5250053000027.

It is an arithmetic number, because the mean of its divisors is an integer number (7875079500039).

Almost surely, 2^{21000212000102} is an apocalyptic number.

21000212000102 is a deficient number, since it is larger than the sum of its proper divisors (10500106000054).

21000212000102 is a wasteful number, since it uses less digits than its factorization.

21000212000102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500106000053.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21000212000102 its reverse (20100021200012), we get a palindrome (41100233200114).

It can be divided in two parts, 2100021200010 and 2, that added together give a palindrome (2100021200012).

The spelling of 21000212000102 in words is "twenty-one trillion, two hundred twelve million, one hundred two", and thus it is an aban number.