21213611540063 has 4 divisors (see below), whose sum is σ = 21213905563920. Its totient is φ = 21213317516208.

The previous prime is 21213611540047. The next prime is 21213611540071. The reversal of 21213611540063 is 36004511631212.

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

It is a cyclic number.

It is not a de Polignac number, because 21213611540063 - 2⁴ = 21213611540047 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 (21213611540663) 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, 146903678 + ... + 147048011.

It is an arithmetic number, because the mean of its divisors is an integer number (5303476390980).

Almost surely, 2^{21213611540063} is an apocalyptic number.

21213611540063 is a deficient number, since it is larger than the sum of its proper divisors (294023857).

21213611540063 is an equidigital number, since it uses as much as digits as its factorization.

21213611540063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294023856.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 21213611540063 in words is "twenty-one trillion, two hundred thirteen billion, six hundred eleven million, five hundred forty thousand, sixty-three".