21500030442040 has 16 divisors (see below), whose sum is σ = 48375068494680. Its totient is φ = 8600012176800.

The previous prime is 21500030442019. The next prime is 21500030442041. The reversal of 21500030442040 is 4024403000512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21500030441996 and 21500030442014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500030442041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268750380486 + ... + 268750380565.

Almost surely, 2^{21500030442040} is an apocalyptic number.

21500030442040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21500030442040 is an abundant number, since it is smaller than the sum of its proper divisors (26875038052640).

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

21500030442040 is a wasteful number, since it uses less digits than its factorization.

21500030442040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537500761062 (or 537500761058 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21500030442040 its reverse (4024403000512), we get a palindrome (25524433442552).

The spelling of 21500030442040 in words is "twenty-one trillion, five hundred billion, thirty million, four hundred forty-two thousand, forty".