21271053454 has 16 divisors (see below), whose sum is σ = 36480256128. Its totient is φ = 9112267512.

The previous prime is 21271053409. The next prime is 21271053457. The reversal of 21271053454 is 45435017212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271053457) 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, 290824 + ... + 356539.

It is an arithmetic number, because the mean of its divisors is an integer number (2280016008).

Almost surely, 2^21271053454 is an apocalyptic number.

21271053454 is a deficient number, since it is larger than the sum of its proper divisors (15209202674).

21271053454 is a wasteful number, since it uses less digits than its factorization.

21271053454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649719.

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 21271053454 in words is "twenty-one billion, two hundred seventy-one million, fifty-three thousand, four hundred fifty-four".