21210001212 has 96 divisors (see below), whose sum is σ = 51989253120. Its totient is φ = 6723475200.

The previous prime is 21210001151. The next prime is 21210001289.

21210001212 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3539683 + ... + 3545669.

It is an arithmetic number, because the mean of its divisors is an integer number (541554720).

Almost surely, 2^21210001212 is an apocalyptic number.

It is an amenable number.

21210001212 is an abundant number, since it is smaller than the sum of its proper divisors (30779251908).

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

21210001212 is a wasteful number, since it uses less digits than its factorization.

21210001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6211 (or 6209 counting only the distinct ones).

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

It can be divided in two parts, 2121000 and 1212, that added together give a palindrome (2122212).

The spelling of 21210001212 in words is "twenty-one billion, two hundred ten million, one thousand, two hundred twelve".