21550225101 has 16 divisors (see below), whose sum is σ = 28925668800. Its totient is φ = 14270974848.

The previous prime is 21550225097. The next prime is 21550225121. The reversal of 21550225101 is 10152205512.

It is not a de Polignac number, because 21550225101 - 2² = 21550225097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550225121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481755 + ... + 524583.

It is an arithmetic number, because the mean of its divisors is an integer number (1807854300).

Almost surely, 2^21550225101 is an apocalyptic number.

It is an amenable number.

21550225101 is a deficient number, since it is larger than the sum of its proper divisors (7375443699).

21550225101 is a wasteful number, since it uses less digits than its factorization.

21550225101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43948.

The product of its (nonzero) digits is 1000, while the sum is 24.

The spelling of 21550225101 in words is "twenty-one billion, five hundred fifty million, two hundred twenty-five thousand, one hundred one".