21216211534411 has 8 divisors (see below), whose sum is σ = 22287237098400. Its totient is φ = 20157567769152.

The previous prime is 21216211534409. The next prime is 21216211534439. The reversal of 21216211534411 is 11443511261212.

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

It is a cyclic number.

It is not a de Polignac number, because 21216211534411 - 2¹ = 21216211534409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21216211534811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3095446170 + ... + 3095453023.

It is an arithmetic number, because the mean of its divisors is an integer number (2785904637300).

Almost surely, 2^{21216211534411} is an apocalyptic number.

21216211534411 is a deficient number, since it is larger than the sum of its proper divisors (1071025563989).

21216211534411 is a wasteful number, since it uses less digits than its factorization.

21216211534411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6190899365.

The product of its digits is 11520, while the sum is 34.

Adding to 21216211534411 its reverse (11443511261212), we get a palindrome (32659722795623).

The spelling of 21216211534411 in words is "twenty-one trillion, two hundred sixteen billion, two hundred eleven million, five hundred thirty-four thousand, four hundred eleven".