21154414331 has 2 divisors, whose sum is σ = 21154414332. Its totient is φ = 21154414330.

The previous prime is 21154414319. The next prime is 21154414397. The reversal of 21154414331 is 13341445112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21154414331 - 2¹⁴ = 21154397947 is a prime.

It is a super-2 number, since 2×21154414331² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21154414294 and 21154414303.

It is not a weakly prime, because it can be changed into another prime (21154411331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577207165 + 10577207166.

It is an arithmetic number, because the mean of its divisors is an integer number (10577207166).

Almost surely, 2^21154414331 is an apocalyptic number.

21154414331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154414331 is an equidigital number, since it uses as much as digits as its factorization.

21154414331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

Adding to 21154414331 its reverse (13341445112), we get a palindrome (34495859443).

The spelling of 21154414331 in words is "twenty-one billion, one hundred fifty-four million, four hundred fourteen thousand, three hundred thirty-one".