21354251135 has 8 divisors (see below), whose sum is σ = 29285830176. Its totient is φ = 14642915040.

The previous prime is 21354251117. The next prime is 21354251153. The reversal of 21354251135 is 53115245312.

It is an interprime number because it is at equal distance from previous prime (21354251117) and next prime (21354251153).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21354251135 - 2¹⁶ = 21354185599 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 305060696 + ... + 305060765.

It is an arithmetic number, because the mean of its divisors is an integer number (3660728772).

Almost surely, 2^21354251135 is an apocalyptic number.

21354251135 is a deficient number, since it is larger than the sum of its proper divisors (7931579041).

21354251135 is an equidigital number, since it uses as much as digits as its factorization.

21354251135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610121473.

The product of its digits is 18000, while the sum is 32.

Adding to 21354251135 its reverse (53115245312), we get a palindrome (74469496447).

The spelling of 21354251135 in words is "twenty-one billion, three hundred fifty-four million, two hundred fifty-one thousand, one hundred thirty-five".