21421512043 has 2 divisors, whose sum is σ = 21421512044. Its totient is φ = 21421512042.

The previous prime is 21421511999. The next prime is 21421512061. The reversal of 21421512043 is 34021512412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21421512043 - 2¹⁷ = 21421380971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21421511999 and 21421512017.

It is not a weakly prime, because it can be changed into another prime (21421512743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710756021 + 10710756022.

It is an arithmetic number, because the mean of its divisors is an integer number (10710756022).

Almost surely, 2^21421512043 is an apocalyptic number.

21421512043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421512043 is an equidigital number, since it uses as much as digits as its factorization.

21421512043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 21421512043 in words is "twenty-one billion, four hundred twenty-one million, five hundred twelve thousand, forty-three".