21052000154 has 16 divisors (see below), whose sum is σ = 31665134760. Its totient is φ = 10496977920.

The previous prime is 21052000139. The next prime is 21052000163. The reversal of 21052000154 is 45100025012.

It can be written as a sum of positive squares in 4 ways, for example, as 7146166225 + 13905833929 = 84535^2 + 117923^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2698892 + ... + 2706680.

Almost surely, 2^21052000154 is an apocalyptic number.

21052000154 is a deficient number, since it is larger than the sum of its proper divisors (10613134606).

21052000154 is a wasteful number, since it uses less digits than its factorization.

21052000154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11345.

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 21052000154 its reverse (45100025012), we get a palindrome (66152025166).

The spelling of 21052000154 in words is "twenty-one billion, fifty-two million, one hundred fifty-four", and thus it is an aban number.