21002020120010 has 32 divisors (see below), whose sum is σ = 37891356638400. Its totient is φ = 8381318106112.

The previous prime is 21002020120001. The next prime is 21002020120061. The reversal of 21002020120010 is 1002102020012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002020119973 and 21002020120000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49299137 + ... + 49723323.

It is an arithmetic number, because the mean of its divisors is an integer number (1184104894950).

Almost surely, 2^{21002020120010} is an apocalyptic number.

21002020120010 is a deficient number, since it is larger than the sum of its proper divisors (16889336518390).

21002020120010 is a wasteful number, since it uses less digits than its factorization.

21002020120010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435670.

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

Adding to 21002020120010 its reverse (1002102020012), we get a palindrome (22004122140022).

The spelling of 21002020120010 in words is "twenty-one trillion, two billion, twenty million, one hundred twenty thousand, ten".