21000210102102 has 32 divisors (see below), whose sum is σ = 52364160255744. Its totient is φ = 5454600026400.

The previous prime is 21000210102101. The next prime is 21000210102127. The reversal of 21000210102102 is 20120101200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000210102101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22727499649 + ... + 22727500572.

It is an arithmetic number, because the mean of its divisors is an integer number (1636380007992).

Almost surely, 2^{21000210102102} is an apocalyptic number.

21000210102102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000210102102 is an abundant number, since it is smaller than the sum of its proper divisors (31363950153642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000210102102 is a wasteful number, since it uses less digits than its factorization.

21000210102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45455000244.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21000210102102 its reverse (20120101200012), we get a palindrome (41120311302114).

The spelling of 21000210102102 in words is "twenty-one trillion, two hundred ten million, one hundred two thousand, one hundred two".