21403000501 has 32 divisors (see below), whose sum is σ = 22989209600. Its totient is φ = 19889452800.

The previous prime is 21403000499. The next prime is 21403000559. The reversal of 21403000501 is 10500030412.

It is a 7-Lehmer number, since φ(21403000501) divides (21403000501-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 21403000501 - 2¹ = 21403000499 is a prime.

It is a deceptive number, since it divides R_21403000500.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403000001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50838271 + ... + 50838691.

It is an arithmetic number, because the mean of its divisors is an integer number (718412800).

Almost surely, 2^21403000501 is an apocalyptic number.

It is an amenable number.

21403000501 is a deficient number, since it is larger than the sum of its proper divisors (1586209099).

21403000501 is a wasteful number, since it uses less digits than its factorization.

21403000501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 21403000501 its reverse (10500030412), we get a palindrome (31903030913).

The spelling of 21403000501 in words is "twenty-one billion, four hundred three million, five hundred one", and thus it is an aban number.