21203122101 has 32 divisors (see below), whose sum is σ = 32683542528. Its totient is φ = 11976621120.

The previous prime is 21203122099. The next prime is 21203122121. The reversal of 21203122101 is 10122130212.

It is not a de Polignac number, because 21203122101 - 2¹ = 21203122099 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203122121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 618066 + ... + 651468.

It is an arithmetic number, because the mean of its divisors is an integer number (1021360704).

Almost surely, 2^21203122101 is an apocalyptic number.

21203122101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21203122101 is a deficient number, since it is larger than the sum of its proper divisors (11480420427).

21203122101 is a wasteful number, since it uses less digits than its factorization.

21203122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33761.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21203122101 its reverse (10122130212), we get a palindrome (31325252313).

The spelling of 21203122101 in words is "twenty-one billion, two hundred three million, one hundred twenty-two thousand, one hundred one".