21542142153 has 16 divisors (see below), whose sum is σ = 32917570560. Its totient is φ = 12275502096.

The previous prime is 21542142137. The next prime is 21542142173. The reversal of 21542142153 is 35124124512.

It is not a de Polignac number, because 21542142153 - 2⁴ = 21542142137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21542142153.

It is not an unprimeable number, because it can be changed into a prime (21542142173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1421175 + ... + 1436252.

It is an arithmetic number, because the mean of its divisors is an integer number (2057348160).

Almost surely, 2^21542142153 is an apocalyptic number.

It is an amenable number.

21542142153 is a deficient number, since it is larger than the sum of its proper divisors (11375428407).

21542142153 is a wasteful number, since it uses less digits than its factorization.

21542142153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857796.

The product of its digits is 9600, while the sum is 30.

Adding to 21542142153 its reverse (35124124512), we get a palindrome (56666266665).

The spelling of 21542142153 in words is "twenty-one billion, five hundred forty-two million, one hundred forty-two thousand, one hundred fifty-three".