21229796557 has 8 divisors (see below), whose sum is σ = 22424272640. Its totient is φ = 20067173280.

The previous prime is 21229796531. The next prime is 21229796561. The reversal of 21229796557 is 75569792212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21229796557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21229796498 and 21229796507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21229796527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7961832 + ... + 7964497.

It is an arithmetic number, because the mean of its divisors is an integer number (2803034080).

Almost surely, 2^21229796557 is an apocalyptic number.

It is an amenable number.

21229796557 is a deficient number, since it is larger than the sum of its proper divisors (1194476083).

21229796557 is a wasteful number, since it uses less digits than its factorization.

21229796557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15926403.

The product of its digits is 4762800, while the sum is 55.

The spelling of 21229796557 in words is "twenty-one billion, two hundred twenty-nine million, seven hundred ninety-six thousand, five hundred fifty-seven".