21000012120210 has 64 divisors (see below), whose sum is σ = 50682486516480. Its totient is φ = 5568623965440.

The previous prime is 21000012120209. The next prime is 21000012120233. The reversal of 21000012120210 is 1202121000012.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 71687299 + ... + 71979641.

It is an arithmetic number, because the mean of its divisors is an integer number (791913851820).

Almost surely, 2^{21000012120210} is an apocalyptic number.

21000012120210 is an abundant number, since it is smaller than the sum of its proper divisors (29682474396270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000012120210 is a wasteful number, since it uses less digits than its factorization.

21000012120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305763.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21000012120210 its reverse (1202121000012), we get a palindrome (22202133120222).

The spelling of 21000012120210 in words is "twenty-one trillion, twelve million, one hundred twenty thousand, two hundred ten".