21242400424212 has 48 divisors (see below), whose sum is σ = 55091782936512. Its totient is φ = 6315636487680.

The previous prime is 21242400424187. The next prime is 21242400424247.

21242400424212 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21242400424212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1518174853 + ... + 1518188844.

It is an arithmetic number, because the mean of its divisors is an integer number (1147745477844).

Almost surely, 2^{21242400424212} is an apocalyptic number.

21242400424212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21242400424212 is an abundant number, since it is smaller than the sum of its proper divisors (33849382512300).

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

21242400424212 is a wasteful number, since it uses less digits than its factorization.

21242400424212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036363768 (or 3036363766 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

It can be divided in two parts, 21242400 and 424212, that added together give a palindrome (21666612).

The spelling of 21242400424212 in words is "twenty-one trillion, two hundred forty-two billion, four hundred million, four hundred twenty-four thousand, two hundred twelve".