21154210513 has 8 divisors (see below), whose sum is σ = 21434798880. Its totient is φ = 20875427040.

The previous prime is 21154210477. The next prime is 21154210523. The reversal of 21154210513 is 31501245112.

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

It is a cyclic number.

It is not a de Polignac number, because 21154210513 - 2³³ = 12564275921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21154210523) 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, 427620 + ... + 474517.

It is an arithmetic number, because the mean of its divisors is an integer number (2679349860).

Almost surely, 2^21154210513 is an apocalyptic number.

It is an amenable number.

21154210513 is a deficient number, since it is larger than the sum of its proper divisors (280588367).

21154210513 is a wasteful number, since it uses less digits than its factorization.

21154210513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902447.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 21154210513 its reverse (31501245112), we get a palindrome (52655455625).

The spelling of 21154210513 in words is "twenty-one billion, one hundred fifty-four million, two hundred ten thousand, five hundred thirteen".