21212011021212 has 36 divisors (see below), whose sum is σ = 58493727362616. Its totient is φ = 6427882127520.

The previous prime is 21212011021099. The next prime is 21212011021259.

21212011021212 is a `hidden beast` number, since 212 + 120 + 110 + 212 + 12 = 666.

21212011021212 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21212011021212² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26782841803 + ... + 26782842594.

Almost surely, 2^{21212011021212} is an apocalyptic number.

21212011021212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21212011021212 is an abundant number, since it is smaller than the sum of its proper divisors (37281716341404).

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

21212011021212 is a wasteful number, since it uses less digits than its factorization.

21212011021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53565684418 (or 53565684413 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

It can be divided in two parts, 2121201 and 1021212, that added together give a palindrome (3142413).

The spelling of 21212011021212 in words is "twenty-one trillion, two hundred twelve billion, eleven million, twenty-one thousand, two hundred twelve".