21001002010 has 16 divisors (see below), whose sum is σ = 38606098176. Its totient is φ = 8221668688.

The previous prime is 21001001971. The next prime is 21001002019. The reversal of 21001002010 is 1020010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001001984 and 21001002002.

It is not an unprimeable number, because it can be changed into a prime (21001002019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22341022 + ... + 22341961.

It is an arithmetic number, because the mean of its divisors is an integer number (2412881136).

Almost surely, 2^21001002010 is an apocalyptic number.

21001002010 is a deficient number, since it is larger than the sum of its proper divisors (17605096166).

21001002010 is a wasteful number, since it uses less digits than its factorization.

21001002010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44683037.

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

Adding to 21001002010 its reverse (1020010012), we get a palindrome (22021012022).

The spelling of 21001002010 in words is "twenty-one billion, one million, two thousand, ten".