11421502165021 has 8 divisors (see below), whose sum is σ = 12318355756280. Its totient is φ = 10527259502592.

The previous prime is 11421502164923. The next prime is 11421502165093. The reversal of 11421502165021 is 12056120512411.

It can be written as a sum of positive squares in 4 ways, for example, as 54388769796 + 11367113395225 = 233214^2 + 3371515^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11421502165021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11421502165121) 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, 652723116 + ... + 652740613.

It is an arithmetic number, because the mean of its divisors is an integer number (1539794469535).

Almost surely, 2^{11421502165021} is an apocalyptic number.

It is an amenable number.

11421502165021 is a deficient number, since it is larger than the sum of its proper divisors (896853591259).

11421502165021 is a wasteful number, since it uses less digits than its factorization.

11421502165021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305464415.

The product of its (nonzero) digits is 4800, while the sum is 31.

Adding to 11421502165021 its reverse (12056120512411), we get a palindrome (23477622677432).

The spelling of 11421502165021 in words is "eleven trillion, four hundred twenty-one billion, five hundred two million, one hundred sixty-five thousand, twenty-one".