21029065818461 has 8 divisors (see below), whose sum is σ = 21282943857720. Its totient is φ = 20776376904192.

The previous prime is 21029065818457. The next prime is 21029065818529. The reversal of 21029065818461 is 16481856092012.

It can be written as a sum of positive squares in 4 ways, for example, as 1222338092836 + 19806727725625 = 1105594^2 + 4450475^2 .

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 21029065818461 - 2² = 21029065818457 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 (21029065818421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297245666 + ... + 297316403.

It is an arithmetic number, because the mean of its divisors is an integer number (2660367982215).

Almost surely, 2^{21029065818461} is an apocalyptic number.

It is an amenable number.

21029065818461 is a deficient number, since it is larger than the sum of its proper divisors (253878039259).

21029065818461 is a wasteful number, since it uses less digits than its factorization.

21029065818461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594562495.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 21029065818461 in words is "twenty-one trillion, twenty-nine billion, sixty-five million, eight hundred eighteen thousand, four hundred sixty-one".