21541423931 has 2 divisors, whose sum is σ = 21541423932. Its totient is φ = 21541423930.

The previous prime is 21541423913. The next prime is 21541423949. The reversal of 21541423931 is 13932414512.

It is a happy number.

Together with previous prime (21541423913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (21541423913) and next prime (21541423949).

It is a cyclic number.

It is not a de Polignac number, because 21541423931 - 2¹⁸ = 21541161787 is a prime.

It is a super-2 number, since 2×21541423931² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21541423891 and 21541423900.

It is not a weakly prime, because it can be changed into another prime (21541423961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10770711965 + 10770711966.

It is an arithmetic number, because the mean of its divisors is an integer number (10770711966).

Almost surely, 2^21541423931 is an apocalyptic number.

21541423931 is a deficient number, since it is larger than the sum of its proper divisors (1).

21541423931 is an equidigital number, since it uses as much as digits as its factorization.

21541423931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The spelling of 21541423931 in words is "twenty-one billion, five hundred forty-one million, four hundred twenty-three thousand, nine hundred thirty-one".