21301601840 has 40 divisors (see below), whose sum is σ = 49638104208. Its totient is φ = 8501392640.

The previous prime is 21301601833. The next prime is 21301601843. The reversal of 21301601840 is 4810610312.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21301601843) by changing a digit.

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, 265091 + ... + 335970.

Almost surely, 2^21301601840 is an apocalyptic number.

21301601840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21301601840 is an abundant number, since it is smaller than the sum of its proper divisors (28336502368).

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

21301601840 is a wasteful number, since it uses less digits than its factorization.

21301601840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601517 (or 601511 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 21301601840 in words is "twenty-one billion, three hundred one million, six hundred one thousand, eight hundred forty".