21367207040 has 64 divisors (see below), whose sum is σ = 51206499000. Its totient is φ = 8525881344.

The previous prime is 21367207003. The next prime is 21367207051. The reversal of 21367207040 is 4070276312.

It can be written as a sum of positive squares in 4 ways, for example, as 21248309824 + 118897216 = 145768^2 + 10904^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 21367206988 and 21367207006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220946 + ... + 302574.

Almost surely, 2^21367207040 is an apocalyptic number.

21367207040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21367207040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25603249500).

21367207040 is an abundant number, since it is smaller than the sum of its proper divisors (29839291960).

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

21367207040 is an equidigital number, since it uses as much as digits as its factorization.

21367207040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82057 (or 82045 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The spelling of 21367207040 in words is "twenty-one billion, three hundred sixty-seven million, two hundred seven thousand, forty".