21521043043214 has 128 divisors (see below), whose sum is σ = 40718267606016. Its totient is φ = 8389713024000.

The previous prime is 21521043043193. The next prime is 21521043043217. The reversal of 21521043043214 is 41234034012512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21521043043217) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50986394 + ... + 51406754.

It is an arithmetic number, because the mean of its divisors is an integer number (318111465672).

Almost surely, 2^{21521043043214} is an apocalyptic number.

21521043043214 is a deficient number, since it is larger than the sum of its proper divisors (19197224562802).

21521043043214 is a wasteful number, since it uses less digits than its factorization.

21521043043214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420634.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 21521043043214 its reverse (41234034012512), we get a palindrome (62755077055726).

The spelling of 21521043043214 in words is "twenty-one trillion, five hundred twenty-one billion, forty-three million, forty-three thousand, two hundred fourteen".