21216031426466 has 8 divisors (see below), whose sum is σ = 31824572999760. Its totient is φ = 10607840426548.

The previous prime is 21216031426463. The next prime is 21216031426529. The reversal of 21216031426466 is 66462413061212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21216031426463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87491996 + ... + 87734151.

It is an arithmetic number, because the mean of its divisors is an integer number (3978071624970).

Almost surely, 2^{21216031426466} is an apocalyptic number.

21216031426466 is a deficient number, since it is larger than the sum of its proper divisors (10608541573294).

21216031426466 is a wasteful number, since it uses less digits than its factorization.

21216031426466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175286688.

The product of its (nonzero) digits is 497664, while the sum is 44.

Adding to 21216031426466 its reverse (66462413061212), we get a palindrome (87678444487678).

The spelling of 21216031426466 in words is "twenty-one trillion, two hundred sixteen billion, thirty-one million, four hundred twenty-six thousand, four hundred sixty-six".