21455034214540 has 24 divisors (see below), whose sum is σ = 45063425598912. Its totient is φ = 8580517733760.

The previous prime is 21455034214531. The next prime is 21455034214547. The reversal of 21455034214540 is 4541243055412.

It is a junction number, because it is equal to n+sod(n) for n = 21455034214493 and 21455034214502.

It is not an unprimeable number, because it can be changed into a prime (21455034214547) 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, 93379396 + ... + 93608875.

It is an arithmetic number, because the mean of its divisors is an integer number (1877642733288).

Almost surely, 2^{21455034214540} is an apocalyptic number.

21455034214540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21455034214540 is an abundant number, since it is smaller than the sum of its proper divisors (23608391384372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21455034214540 is a wasteful number, since it uses less digits than its factorization.

21455034214540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186994017 (or 186994015 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 40.

Adding to 21455034214540 its reverse (4541243055412), we get a palindrome (25996277269952).

The spelling of 21455034214540 in words is "twenty-one trillion, four hundred fifty-five billion, thirty-four million, two hundred fourteen thousand, five hundred forty".