21347435741 has 2 divisors, whose sum is σ = 21347435742. Its totient is φ = 21347435740.

The previous prime is 21347435723. The next prime is 21347435761. The reversal of 21347435741 is 14753474312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11871192025 + 9476243716 = 108955^2 + 97346^2 .

It is a cyclic number.

It is not a de Polignac number, because 21347435741 - 2¹⁸ = 21347173597 is a prime.

It is a super-2 number, since 2×21347435741² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21347435761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10673717870 + 10673717871.

It is an arithmetic number, because the mean of its divisors is an integer number (10673717871).

Almost surely, 2^21347435741 is an apocalyptic number.

It is an amenable number.

21347435741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21347435741 is an equidigital number, since it uses as much as digits as its factorization.

21347435741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 41.

The spelling of 21347435741 in words is "twenty-one billion, three hundred forty-seven million, four hundred thirty-five thousand, seven hundred forty-one".