21216611245141 has 4 divisors (see below), whose sum is σ = 22848658264012. Its totient is φ = 19584564226272.

The previous prime is 21216611245133. The next prime is 21216611245153. The reversal of 21216611245141 is 14154211661212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6678244692900 + 14538366552241 = 2584230^2 + 3812921^2 .

It is a cyclic number.

It is not a de Polignac number, because 21216611245141 - 2³ = 21216611245133 is a prime.

It is a super-2 number, since 2×21216611245141² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21216611245141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216611245241) 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, 816023509416 + ... + 816023509441.

It is an arithmetic number, because the mean of its divisors is an integer number (5712164566003).

Almost surely, 2^{21216611245141} is an apocalyptic number.

It is an amenable number.

21216611245141 is a deficient number, since it is larger than the sum of its proper divisors (1632047018871).

21216611245141 is a wasteful number, since it uses less digits than its factorization.

21216611245141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632047018870.

The product of its digits is 23040, while the sum is 37.

The spelling of 21216611245141 in words is "twenty-one trillion, two hundred sixteen billion, six hundred eleven million, two hundred forty-five thousand, one hundred forty-one".