21434253542155 has 4 divisors (see below), whose sum is σ = 25721104250592. Its totient is φ = 17147402833720.

The previous prime is 21434253542113. The next prime is 21434253542183. The reversal of 21434253542155 is 55124535243412.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21434253542155 - 2¹¹ = 21434253540107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2143425354211 + ... + 2143425354220.

It is an arithmetic number, because the mean of its divisors is an integer number (6430276062648).

Almost surely, 2^{21434253542155} is an apocalyptic number.

21434253542155 is a deficient number, since it is larger than the sum of its proper divisors (4286850708437).

21434253542155 is an equidigital number, since it uses as much as digits as its factorization.

21434253542155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286850708436.

The product of its digits is 2880000, while the sum is 46.

Adding to 21434253542155 its reverse (55124535243412), we get a palindrome (76558788785567).

The spelling of 21434253542155 in words is "twenty-one trillion, four hundred thirty-four billion, two hundred fifty-three million, five hundred forty-two thousand, one hundred fifty-five".