21211212022012 has 18 divisors (see below), whose sum is σ = 39431569755872. Its totient is φ = 9981746833344.

The previous prime is 21211212021997. The next prime is 21211212022043. The reversal of 21211212022012 is 21022021211212.

It is a super-4 number, since 4×21211212022012⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9174398508 + ... + 9174400819.

Almost surely, 2^{21211212022012} is an apocalyptic number.

It is an amenable number.

21211212022012 is a deficient number, since it is larger than the sum of its proper divisors (18220357733860).

21211212022012 is a wasteful number, since it uses less digits than its factorization.

21211212022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18348799365 (or 18348799346 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21211212022012 its reverse (21022021211212), we get a palindrome (42233233233224).

The spelling of 21211212022012 in words is "twenty-one trillion, two hundred eleven billion, two hundred twelve million, twenty-two thousand, twelve".