21148562388 has 24 divisors (see below), whose sum is σ = 51048254880. Its totient is φ = 6806433760.

The previous prime is 21148562363. The next prime is 21148562443. The reversal of 21148562388 is 88326584112.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 30385518 + ... + 30386213.

It is an arithmetic number, because the mean of its divisors is an integer number (2127010620).

Almost surely, 2^21148562388 is an apocalyptic number.

It is an amenable number.

21148562388 is an abundant number, since it is smaller than the sum of its proper divisors (29899692492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21148562388 is a wasteful number, since it uses less digits than its factorization.

21148562388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60771767 (or 60771765 counting only the distinct ones).

The product of its digits is 737280, while the sum is 48.

The spelling of 21148562388 in words is "twenty-one billion, one hundred forty-eight million, five hundred sixty-two thousand, three hundred eighty-eight".