21372161843 has 2 divisors, whose sum is σ = 21372161844. Its totient is φ = 21372161842.

The previous prime is 21372161831. The next prime is 21372161857. The reversal of 21372161843 is 34816127312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21372161843 - 2¹⁰ = 21372160819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21372161797 and 21372161806.

It is not a weakly prime, because it can be changed into another prime (21372161803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686080921 + 10686080922.

It is an arithmetic number, because the mean of its divisors is an integer number (10686080922).

Almost surely, 2^21372161843 is an apocalyptic number.

21372161843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21372161843 is an equidigital number, since it uses as much as digits as its factorization.

21372161843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The spelling of 21372161843 in words is "twenty-one billion, three hundred seventy-two million, one hundred sixty-one thousand, eight hundred forty-three".