21020021212210 has 8 divisors (see below), whose sum is σ = 37836038181996. Its totient is φ = 8408008484880.

The previous prime is 21020021212193. The next prime is 21020021212261. The reversal of 21020021212210 is 1221212002012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19424496026329 + 1595525185881 = 4407323^2 + 1263141^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051001060601 + ... + 1051001060620.

Almost surely, 2^{21020021212210} is an apocalyptic number.

21020021212210 is a deficient number, since it is larger than the sum of its proper divisors (16816016969786).

21020021212210 is a wasteful number, since it uses less digits than its factorization.

21020021212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102002121228.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020021212210 its reverse (1221212002012), we get a palindrome (22241233214222).

The spelling of 21020021212210 in words is "twenty-one trillion, twenty billion, twenty-one million, two hundred twelve thousand, two hundred ten".