21342228132537 has 24 divisors (see below), whose sum is σ = 33199220398344. Its totient is φ = 13133600181504.

The previous prime is 21342228132503. The next prime is 21342228132569. The reversal of 21342228132537 is 73523182224312.

It is a happy number.

21342228132537 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 2 + 2 + 2 + 81 + 32 + 537 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 382413612816 + 20959814519721 = 618396^2 + 4578189^2 .

It is not a de Polignac number, because 21342228132537 - 2⁷ = 21342228132409 is a prime.

It is a super-2 number, since 2×21342228132537² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21342228132492 and 21342228132501.

It is not an unprimeable number, because it can be changed into a prime (21342228232537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23618383 + ... + 24505355.

It is an arithmetic number, because the mean of its divisors is an integer number (1383300849931).

Almost surely, 2^{21342228132537} is an apocalyptic number.

It is an amenable number.

21342228132537 is a deficient number, since it is larger than the sum of its proper divisors (11856992265807).

21342228132537 is a wasteful number, since it uses less digits than its factorization.

21342228132537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092649 (or 1092646 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The spelling of 21342228132537 in words is "twenty-one trillion, three hundred forty-two billion, two hundred twenty-eight million, one hundred thirty-two thousand, five hundred thirty-seven".