21534730601 has 2 divisors, whose sum is σ = 21534730602. Its totient is φ = 21534730600.

The previous prime is 21534730583. The next prime is 21534730621. The reversal of 21534730601 is 10603743512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21456390400 + 78340201 = 146480^2 + 8851^2 .

It is a cyclic number.

It is not a de Polignac number, because 21534730601 - 2³⁴ = 4354861417 is a prime.

It is not a weakly prime, because it can be changed into another prime (21534730621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767365300 + 10767365301.

It is an arithmetic number, because the mean of its divisors is an integer number (10767365301).

Almost surely, 2^21534730601 is an apocalyptic number.

It is an amenable number.

21534730601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21534730601 is an equidigital number, since it uses as much as digits as its factorization.

21534730601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 21534730601 in words is "twenty-one billion, five hundred thirty-four million, seven hundred thirty thousand, six hundred one".