21015016154 has 16 divisors (see below), whose sum is σ = 34486754400. Its totient is φ = 9524906160.

The previous prime is 21015016151. The next prime is 21015016181. The reversal of 21015016154 is 45161051012.

It is not an unprimeable number, because it can be changed into a prime (21015016151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1360844 + ... + 1376199.

It is an arithmetic number, because the mean of its divisors is an integer number (2155422150).

Almost surely, 2^21015016154 is an apocalyptic number.

21015016154 is a deficient number, since it is larger than the sum of its proper divisors (13471738246).

21015016154 is a wasteful number, since it uses less digits than its factorization.

21015016154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737405.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 21015016154 its reverse (45161051012), we get a palindrome (66176067166).

The spelling of 21015016154 in words is "twenty-one billion, fifteen million, sixteen thousand, one hundred fifty-four".