21203101042040 has 192 divisors, whose sum is σ = 49635939382560. Its totient is φ = 8145660948480.

The previous prime is 21203101041853. The next prime is 21203101042043. The reversal of 21203101042040 is 4024010130212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203101042043) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9624647579 + ... + 9624649781.

Almost surely, 2^{21203101042040} is an apocalyptic number.

21203101042040 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 21203101042040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24817969691280).

21203101042040 is an abundant number, since it is smaller than the sum of its proper divisors (28432838340520).

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

21203101042040 is a wasteful number, since it uses less digits than its factorization.

21203101042040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250 (or 3157 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21203101042040 its reverse (4024010130212), we get a palindrome (25227111172252).

The spelling of 21203101042040 in words is "twenty-one trillion, two hundred three billion, one hundred one million, forty-two thousand, forty".