21435402760813 has 4 divisors (see below), whose sum is σ = 21436373017948. Its totient is φ = 21434432503680.

The previous prime is 21435402760769. The next prime is 21435402760823. The reversal of 21435402760813 is 31806720453412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14554240260004 + 6881162500809 = 3815002^2 + 2623197^2 .

It is a cyclic number.

It is not a de Polignac number, because 21435402760813 - 2¹⁷ = 21435402629741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435402760823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485095428 + ... + 485139613.

It is an arithmetic number, because the mean of its divisors is an integer number (5359093254487).

Almost surely, 2^{21435402760813} is an apocalyptic number.

It is an amenable number.

21435402760813 is a deficient number, since it is larger than the sum of its proper divisors (970257135).

21435402760813 is an equidigital number, since it uses as much as digits as its factorization.

21435402760813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970257134.

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 21435402760813 in words is "twenty-one trillion, four hundred thirty-five billion, four hundred two million, seven hundred sixty thousand, eight hundred thirteen".