21241651508 has 36 divisors (see below), whose sum is σ = 47173023072. Its totient is φ = 8275967280.

The previous prime is 21241651507. The next prime is 21241651513. The reversal of 21241651508 is 80515614212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241651507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4924016 + ... + 4928327.

It is an arithmetic number, because the mean of its divisors is an integer number (1310361752).

Almost surely, 2^21241651508 is an apocalyptic number.

21241651508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21241651508 is an abundant number, since it is smaller than the sum of its proper divisors (25931371564).

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

21241651508 is a wasteful number, since it uses less digits than its factorization.

21241651508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9852372 (or 9852363 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The spelling of 21241651508 in words is "twenty-one billion, two hundred forty-one million, six hundred fifty-one thousand, five hundred eight".