21213611545603 has 2 divisors, whose sum is σ = 21213611545604. Its totient is φ = 21213611545602.

The previous prime is 21213611545541. The next prime is 21213611545613. The reversal of 21213611545603 is 30654511631212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21213611545603 - 2¹⁷ = 21213611414531 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213611545613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606805772801 + 10606805772802.

It is an arithmetic number, because the mean of its divisors is an integer number (10606805772802).

Almost surely, 2^{21213611545603} is an apocalyptic number.

21213611545603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213611545603 is an equidigital number, since it uses as much as digits as its factorization.

21213611545603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 21213611545603 in words is "twenty-one trillion, two hundred thirteen billion, six hundred eleven million, five hundred forty-five thousand, six hundred three".