21148562389 has 4 divisors (see below), whose sum is σ = 22261644640. Its totient is φ = 20035480140.

The previous prime is 21148562363. The next prime is 21148562443. The reversal of 21148562389 is 98326584112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21148562389 - 2¹⁵ = 21148529621 is a prime.

It is a super-3 number, since 3×21148562389³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148562339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556541097 + ... + 556541134.

It is an arithmetic number, because the mean of its divisors is an integer number (5565411160).

Almost surely, 2^21148562389 is an apocalyptic number.

It is an amenable number.

21148562389 is a deficient number, since it is larger than the sum of its proper divisors (1113082251).

21148562389 is a wasteful number, since it uses less digits than its factorization.

21148562389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113082250.

The product of its digits is 829440, while the sum is 49.

The spelling of 21148562389 in words is "twenty-one billion, one hundred forty-eight million, five hundred sixty-two thousand, three hundred eighty-nine".