21421222212412 has 24 divisors (see below), whose sum is σ = 41316659158320. Its totient is φ = 9636538575360.

The previous prime is 21421222212407. The next prime is 21421222212463.

It is a happy number.

21421222212412 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21421222212412² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2509510987 + ... + 2509519522.

It is an arithmetic number, because the mean of its divisors is an integer number (1721527464930).

Almost surely, 2^{21421222212412} is an apocalyptic number.

21421222212412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21421222212412 is a deficient number, since it is larger than the sum of its proper divisors (19895436945908).

21421222212412 is a wasteful number, since it uses less digits than its factorization.

21421222212412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5019030621 (or 5019030619 counting only the distinct ones).

The product of its digits is 4096, while the sum is 28.

It can be divided in two parts, 2142122 and 2212412, that added together give a palindrome (4354534).

The spelling of 21421222212412 in words is "twenty-one trillion, four hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, four hundred twelve".