21002020120202 has 16 divisors (see below), whose sum is σ = 35861156885952. Its totient is φ = 9131313095520.

The previous prime is 21002020120177. The next prime is 21002020120241. The reversal of 21002020120202 is 20202102020012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20752983803 + ... + 20752984814.

It is an arithmetic number, because the mean of its divisors is an integer number (2241322305372).

Almost surely, 2^{21002020120202} is an apocalyptic number.

21002020120202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21002020120202 is a deficient number, since it is larger than the sum of its proper divisors (14859136765750).

21002020120202 is a wasteful number, since it uses less digits than its factorization.

21002020120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41505968653.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21002020120202 its reverse (20202102020012), we get a palindrome (41204122140214).

The spelling of 21002020120202 in words is "twenty-one trillion, two billion, twenty million, one hundred twenty thousand, two hundred two".