21004153202015 has 16 divisors (see below), whose sum is σ = 25691419318656. Its totient is φ = 16481575699200.

The previous prime is 21004153201979. The next prime is 21004153202077. The reversal of 21004153202015 is 51020235140012.

It is not a de Polignac number, because 21004153202015 - 2⁶ = 21004153201951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158899751 + ... + 159031880.

It is an arithmetic number, because the mean of its divisors is an integer number (1605713707416).

Almost surely, 2^{21004153202015} is an apocalyptic number.

21004153202015 is a deficient number, since it is larger than the sum of its proper divisors (4687266116641).

21004153202015 is a wasteful number, since it uses less digits than its factorization.

21004153202015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317931890.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21004153202015 its reverse (51020235140012), we get a palindrome (72024388342027).

The spelling of 21004153202015 in words is "twenty-one trillion, four billion, one hundred fifty-three million, two hundred two thousand, fifteen".