21521003314154 has 8 divisors (see below), whose sum is σ = 32281954558308. Its totient is φ = 10760351794720.

The previous prime is 21521003314133. The next prime is 21521003314169. The reversal of 21521003314154 is 45141330012512.

It can be written as a sum of positive squares in 2 ways, for example, as 20465010725929 + 1055992588225 = 4523827^2 + 1027615^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21521003314154.

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, 74751587 + ... + 75038934.

Almost surely, 2^{21521003314154} is an apocalyptic number.

21521003314154 is a deficient number, since it is larger than the sum of its proper divisors (10760951244154).

21521003314154 is a wasteful number, since it uses less digits than its factorization.

21521003314154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149862360.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21521003314154 its reverse (45141330012512), we get a palindrome (66662333326666).

The spelling of 21521003314154 in words is "twenty-one trillion, five hundred twenty-one billion, three million, three hundred fourteen thousand, one hundred fifty-four".