21551432155343 has 2 divisors, whose sum is σ = 21551432155344. Its totient is φ = 21551432155342.

The previous prime is 21551432155189. The next prime is 21551432155427. The reversal of 21551432155343 is 34355123415512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21551432155343 - 2²² = 21551427961039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21551432155294 and 21551432155303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21551432155843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10775716077671 + 10775716077672.

It is an arithmetic number, because the mean of its divisors is an integer number (10775716077672).

Almost surely, 2^{21551432155343} is an apocalyptic number.

21551432155343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21551432155343 is an equidigital number, since it uses as much as digits as its factorization.

21551432155343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080000, while the sum is 44.

The spelling of 21551432155343 in words is "twenty-one trillion, five hundred fifty-one billion, four hundred thirty-two million, one hundred fifty-five thousand, three hundred forty-three".