21213611504643 has 8 divisors (see below), whose sum is σ = 28886619921408. Its totient is φ = 13841505378824.

The previous prime is 21213611504633. The next prime is 21213611504651. The reversal of 21213611504643 is 34640511631212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21213611504643 - 2²⁶ = 21213544395779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213611504633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75225572571 + ... + 75225572852.

It is an arithmetic number, because the mean of its divisors is an integer number (3610827490176).

Almost surely, 2^{21213611504643} is an apocalyptic number.

21213611504643 is a deficient number, since it is larger than the sum of its proper divisors (7673008416765).

21213611504643 is a wasteful number, since it uses less digits than its factorization.

21213611504643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150451145473.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 21213611504643 in words is "twenty-one trillion, two hundred thirteen billion, six hundred eleven million, five hundred four thousand, six hundred forty-three".