21152350451420 has 48 divisors (see below), whose sum is σ = 45590688422496. Its totient is φ = 8238731904000.

The previous prime is 21152350451417. The next prime is 21152350451437. The reversal of 21152350451420 is 2415405325112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24328586 + ... + 25183025.

It is an arithmetic number, because the mean of its divisors is an integer number (949806008802).

Almost surely, 2^{21152350451420} is an apocalyptic number.

21152350451420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152350451420 is an abundant number, since it is smaller than the sum of its proper divisors (24438337971076).

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

21152350451420 is a wasteful number, since it uses less digits than its factorization.

21152350451420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49512182 (or 49512180 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 21152350451420 its reverse (2415405325112), we get a palindrome (23567755776532).

The spelling of 21152350451420 in words is "twenty-one trillion, one hundred fifty-two billion, three hundred fifty million, four hundred fifty-one thousand, four hundred twenty".