21223545131 has 4 divisors (see below), whose sum is σ = 21717115992. Its totient is φ = 20729974272.

The previous prime is 21223545103. The next prime is 21223545137. The reversal of 21223545131 is 13154532212.

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

It is a cyclic number.

It is not a de Polignac number, because 21223545131 - 2¹⁴ = 21223528747 is a prime.

It is a super-2 number, since 2×21223545131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223545094 and 21223545103.

It is not an unprimeable number, because it can be changed into a prime (21223545137) 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, 246785366 + ... + 246785451.

It is an arithmetic number, because the mean of its divisors is an integer number (5429278998).

Almost surely, 2^21223545131 is an apocalyptic number.

21223545131 is a deficient number, since it is larger than the sum of its proper divisors (493570861).

21223545131 is an equidigital number, since it uses as much as digits as its factorization.

21223545131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493570860.

The product of its digits is 7200, while the sum is 29.

The spelling of 21223545131 in words is "twenty-one billion, two hundred twenty-three million, five hundred forty-five thousand, one hundred thirty-one".