21013334433240 has 32 divisors (see below), whose sum is σ = 63040003300080. Its totient is φ = 5603555848832.

The previous prime is 21013334433229. The next prime is 21013334433253. The reversal of 21013334433240 is 4233443331012.

It is a happy number.

It is a congruent number.

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, 87555560019 + ... + 87555560258.

Almost surely, 2^{21013334433240} is an apocalyptic number.

21013334433240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013334433240 is an abundant number, since it is smaller than the sum of its proper divisors (42026668866840).

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

21013334433240 is a wasteful number, since it uses less digits than its factorization.

21013334433240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175111120291 (or 175111120287 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 33.

Adding to 21013334433240 its reverse (4233443331012), we get a palindrome (25246777764252).

The spelling of 21013334433240 in words is "twenty-one trillion, thirteen billion, three hundred thirty-four million, four hundred thirty-three thousand, two hundred forty".