21550232001 has 8 divisors (see below), whose sum is σ = 28743103584. Its totient is φ = 14362090880.

The previous prime is 21550231991. The next prime is 21550232023. The reversal of 21550232001 is 10023205512.

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

It is a cyclic number.

It is not a de Polignac number, because 21550232001 - 2⁷ = 21550231873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21550232101) 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, 1171971 + ... + 1190216.

It is an arithmetic number, because the mean of its divisors is an integer number (3592887948).

Almost surely, 2^21550232001 is an apocalyptic number.

It is an amenable number.

21550232001 is a deficient number, since it is larger than the sum of its proper divisors (7192871583).

21550232001 is a wasteful number, since it uses less digits than its factorization.

21550232001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365231.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 21550232001 its reverse (10023205512), we get a palindrome (31573437513).

The spelling of 21550232001 in words is "twenty-one billion, five hundred fifty million, two hundred thirty-two thousand, one".