21514453155 has 48 divisors (see below), whose sum is σ = 41545183680. Its totient is φ = 10226490624.

The previous prime is 21514453153. The next prime is 21514453199. The reversal of 21514453155 is 55135441512.

21514453155 is a `hidden beast` number, since 2 + 1 + 51 + 4 + 453 + 155 = 666.

It is not a de Polignac number, because 21514453155 - 2¹ = 21514453153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21514453153) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 617119 + ... + 651048.

It is an arithmetic number, because the mean of its divisors is an integer number (865524660).

Almost surely, 2^21514453155 is an apocalyptic number.

21514453155 is a deficient number, since it is larger than the sum of its proper divisors (20030730525).

21514453155 is a wasteful number, since it uses less digits than its factorization.

21514453155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268220 (or 1268217 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

Adding to 21514453155 its reverse (55135441512), we get a palindrome (76649894667).

The spelling of 21514453155 in words is "twenty-one billion, five hundred fourteen million, four hundred fifty-three thousand, one hundred fifty-five".