21000102010 has 32 divisors (see below), whose sum is σ = 38733375744. Its totient is φ = 8192784000.

The previous prime is 21000101911. The next prime is 21000102017. The reversal of 21000102010 is 1020100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000101984 and 21000102002.

It is not an unprimeable number, because it can be changed into a prime (21000102017) 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, 2221995 + ... + 2231425.

It is an arithmetic number, because the mean of its divisors is an integer number (1210417992).

Almost surely, 2^21000102010 is an apocalyptic number.

21000102010 is a deficient number, since it is larger than the sum of its proper divisors (17733273734).

21000102010 is a wasteful number, since it uses less digits than its factorization.

21000102010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14910.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21000102010 its reverse (1020100012), we get a palindrome (22020202022).

The spelling of 21000102010 in words is "twenty-one billion, one hundred two thousand, ten".