21434130155405 has 32 divisors (see below), whose sum is σ = 28329446062080. Its totient is φ = 15438417606720.

The previous prime is 21434130155377. The next prime is 21434130155423. The reversal of 21434130155405 is 50455103143412.

It is not a de Polignac number, because 21434130155405 - 2³⁰ = 21433056413581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20433032 + ... + 21456398.

It is an arithmetic number, because the mean of its divisors is an integer number (885295189440).

Almost surely, 2^{21434130155405} is an apocalyptic number.

It is an amenable number.

21434130155405 is a deficient number, since it is larger than the sum of its proper divisors (6895315906675).

21434130155405 is a wasteful number, since it uses less digits than its factorization.

21434130155405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027049.

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 21434130155405 its reverse (50455103143412), we get a palindrome (71889233298817).

The spelling of 21434130155405 in words is "twenty-one trillion, four hundred thirty-four billion, one hundred thirty million, one hundred fifty-five thousand, four hundred five".