21213545032412 has 6 divisors (see below), whose sum is σ = 37123703806728. Its totient is φ = 10606772516204.

The previous prime is 21213545032399. The next prime is 21213545032423. The reversal of 21213545032412 is 21423054531212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651693129048 + ... + 2651693129055.

It is an arithmetic number, because the mean of its divisors is an integer number (6187283967788).

Almost surely, 2^{21213545032412} is an apocalyptic number.

It is an amenable number.

21213545032412 is a deficient number, since it is larger than the sum of its proper divisors (15910158774316).

21213545032412 is a wasteful number, since it uses less digits than its factorization.

21213545032412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5303386258107 (or 5303386258105 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21213545032412 its reverse (21423054531212), we get a palindrome (42636599563624).

The spelling of 21213545032412 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-five million, thirty-two thousand, four hundred twelve".