21213405361045 has 16 divisors (see below), whose sum is σ = 26001192856320. Its totient is φ = 16607416883904.

The previous prime is 21213405361007. The next prime is 21213405361061. The reversal of 21213405361045 is 54016350431212.

It is a cyclic number.

It is not a de Polignac number, because 21213405361045 - 2²⁹ = 21212868490133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213405360995 and 21213405361013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4298202 + ... + 7803931.

It is an arithmetic number, because the mean of its divisors is an integer number (1625074553520).

Almost surely, 2^{21213405361045} is an apocalyptic number.

It is an amenable number.

21213405361045 is a deficient number, since it is larger than the sum of its proper divisors (4787787495275).

21213405361045 is a wasteful number, since it uses less digits than its factorization.

21213405361045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12109644.

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 21213405361045 its reverse (54016350431212), we get a palindrome (75229755792257).

The spelling of 21213405361045 in words is "twenty-one trillion, two hundred thirteen billion, four hundred five million, three hundred sixty-one thousand, forty-five".