21216030420361 has 64 divisors (see below), whose sum is σ = 27140956416000. Its totient is φ = 16144748928000.

The previous prime is 21216030420353. The next prime is 21216030420373. The reversal of 21216030420361 is 16302403061212.

It is not a de Polignac number, because 21216030420361 - 2³ = 21216030420353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21216030220361) 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, 3279642835 + ... + 3279649303.

It is an arithmetic number, because the mean of its divisors is an integer number (424077444000).

Almost surely, 2^{21216030420361} is an apocalyptic number.

It is an amenable number.

21216030420361 is a deficient number, since it is larger than the sum of its proper divisors (5924925995639).

21216030420361 is a wasteful number, since it uses less digits than its factorization.

21216030420361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12542.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21216030420361 its reverse (16302403061212), we get a palindrome (37518433481573).

The spelling of 21216030420361 in words is "twenty-one trillion, two hundred sixteen billion, thirty million, four hundred twenty thousand, three hundred sixty-one".