21112501040 has 80 divisors (see below), whose sum is σ = 49350912768. Its totient is φ = 8399659008.

The previous prime is 21112501037. The next prime is 21112501043. The reversal of 21112501040 is 4010521112.

It is an interprime number because it is at equal distance from previous prime (21112501037) and next prime (21112501043).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (21112501043) 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 15 ways as a sum of consecutive naturals, for example, 21609032 + ... + 21610008.

Almost surely, 2^21112501040 is an apocalyptic number.

21112501040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112501040 is an abundant number, since it is smaller than the sum of its proper divisors (28238411728).

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

21112501040 is a wasteful number, since it uses less digits than its factorization.

21112501040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166 (or 2160 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The spelling of 21112501040 in words is "twenty-one billion, one hundred twelve million, five hundred one thousand, forty".