21203213432240 has 160 divisors (see below), whose sum is σ = 58828186469376. Its totient is φ = 6949028275200.

The previous prime is 21203213432237. The next prime is 21203213432249. The reversal of 21203213432240 is 4223431230212.

It is a super-2 number, since 2×21203213432240² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21203213432249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19075790 + ... + 20156690.

Almost surely, 2^{21203213432240} is an apocalyptic number.

21203213432240 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 21203213432240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29414093234688).

21203213432240 is an abundant number, since it is smaller than the sum of its proper divisors (37624973037136).

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

21203213432240 is a wasteful number, since it uses less digits than its factorization.

21203213432240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082467 (or 1082461 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21203213432240 its reverse (4223431230212), we get a palindrome (25426644662452).

The spelling of 21203213432240 in words is "twenty-one trillion, two hundred three billion, two hundred thirteen million, four hundred thirty-two thousand, two hundred forty".