21531430254214 has 4 divisors (see below), whose sum is σ = 32297145381324. Its totient is φ = 10765715127106.

The previous prime is 21531430254209. The next prime is 21531430254227. The reversal of 21531430254214 is 41245203413512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5382857563552 + ... + 5382857563555.

It is an arithmetic number, because the mean of its divisors is an integer number (8074286345331).

Almost surely, 2^{21531430254214} is an apocalyptic number.

21531430254214 is a deficient number, since it is larger than the sum of its proper divisors (10765715127110).

21531430254214 is a wasteful number, since it uses less digits than its factorization.

21531430254214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10765715127109.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 21531430254214 its reverse (41245203413512), we get a palindrome (62776633667726).

The spelling of 21531430254214 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred thirty million, two hundred fifty-four thousand, two hundred fourteen".