21301473128 has 32 divisors (see below), whose sum is σ = 44012892000. Its totient is φ = 9602808768.

The previous prime is 21301473121. The next prime is 21301473163. The reversal of 21301473128 is 82137410312.

It is a super-2 number, since 2×21301473128² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21301473094 and 21301473103.

It is not an unprimeable number, because it can be changed into a prime (21301473121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2377178 + ... + 2386121.

It is an arithmetic number, because the mean of its divisors is an integer number (1375402875).

Almost surely, 2^21301473128 is an apocalyptic number.

It is an amenable number.

21301473128 is an abundant number, since it is smaller than the sum of its proper divisors (22711418872).

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

21301473128 is a wasteful number, since it uses less digits than its factorization.

21301473128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4763361 (or 4763357 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 21301473128 in words is "twenty-one billion, three hundred one million, four hundred seventy-three thousand, one hundred twenty-eight".