21210220212012 has 48 divisors (see below), whose sum is σ = 59219418259680. Its totient is φ = 6526221603264.

The previous prime is 21210220212011. The next prime is 21210220212101. The reversal of 21210220212012 is 21021202201212.

It is a happy number.

21210220212012 is a `hidden beast` number, since 21 + 210 + 220 + 212 + 0 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21210220212011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7553495823 + ... + 7553498630.

It is an arithmetic number, because the mean of its divisors is an integer number (1233737880410).

Almost surely, 2^{21210220212012} is an apocalyptic number.

It is an amenable number.

21210220212012 is an abundant number, since it is smaller than the sum of its proper divisors (38009198047668).

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

21210220212012 is a wasteful number, since it uses less digits than its factorization.

21210220212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15106994479 (or 15106994471 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210220212012 its reverse (21021202201212), we get a palindrome (42231422413224).

The spelling of 21210220212012 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, two hundred twelve thousand, twelve".