21454010211205 has 16 divisors (see below), whose sum is σ = 30245653557504. Its totient is φ = 14402692169280.

The previous prime is 21454010211181. The next prime is 21454010211251. The reversal of 21454010211205 is 50211201045412.

It is not a de Polignac number, because 21454010211205 - 2¹⁵ = 21454010178437 is a prime.

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, 15002803629 + ... + 15002805058.

It is an arithmetic number, because the mean of its divisors is an integer number (1890353347344).

Almost surely, 2^{21454010211205} is an apocalyptic number.

It is an amenable number.

21454010211205 is a deficient number, since it is larger than the sum of its proper divisors (8791643346299).

21454010211205 is a wasteful number, since it uses less digits than its factorization.

21454010211205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30005608716.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 21454010211205 its reverse (50211201045412), we get a palindrome (71665211256617).

The spelling of 21454010211205 in words is "twenty-one trillion, four hundred fifty-four billion, ten million, two hundred eleven thousand, two hundred five".