21354511415 has 8 divisors (see below), whose sum is σ = 25631032608. Its totient is φ = 17079863200.

The previous prime is 21354511363. The next prime is 21354511447. The reversal of 21354511415 is 51411545312.

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

It is not a de Polignac number, because 21354511415 - 2¹⁴ = 21354495031 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, 443036 + ... + 488865.

It is an arithmetic number, because the mean of its divisors is an integer number (3203879076).

Almost surely, 2^21354511415 is an apocalyptic number.

21354511415 is a deficient number, since it is larger than the sum of its proper divisors (4276521193).

21354511415 is an equidigital number, since it uses as much as digits as its factorization.

21354511415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936489.

The product of its digits is 12000, while the sum is 32.

The spelling of 21354511415 in words is "twenty-one billion, three hundred fifty-four million, five hundred eleven thousand, four hundred fifteen".