21542154514 has 16 divisors (see below), whose sum is σ = 34571537280. Its totient is φ = 10036895760.

The previous prime is 21542154497. The next prime is 21542154527. The reversal of 21542154514 is 41545124512.

It is a super-2 number, since 2×21542154514² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21542154514.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4644394 + ... + 4649029.

It is an arithmetic number, because the mean of its divisors is an integer number (2160721080).

Almost surely, 2^21542154514 is an apocalyptic number.

21542154514 is a deficient number, since it is larger than the sum of its proper divisors (13029382766).

21542154514 is a wasteful number, since it uses less digits than its factorization.

21542154514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9293505.

The product of its digits is 32000, while the sum is 34.

The spelling of 21542154514 in words is "twenty-one billion, five hundred forty-two million, one hundred fifty-four thousand, five hundred fourteen".