21148859064 has 32 divisors (see below), whose sum is σ = 52989930000. Its totient is φ = 7033915392.

The previous prime is 21148859063. The next prime is 21148859107. The reversal of 21148859064 is 46095884112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148859063) 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, 970519 + ... + 992070.

Almost surely, 2^21148859064 is an apocalyptic number.

21148859064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21148859064 is an abundant number, since it is smaller than the sum of its proper divisors (31841070936).

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

21148859064 is a wasteful number, since it uses less digits than its factorization.

21148859064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963047 (or 1963043 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 21148859064 in words is "twenty-one billion, one hundred forty-eight million, eight hundred fifty-nine thousand, sixty-four".