21101022201 has 8 divisors (see below), whose sum is σ = 32153938624. Its totient is φ = 12057726960.

The previous prime is 21101022199. The next prime is 21101022209. The reversal of 21101022201 is 10222010112.

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

It is not a de Polignac number, because 21101022201 - 2¹ = 21101022199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101022209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502405270 + ... + 502405311.

It is an arithmetic number, because the mean of its divisors is an integer number (4019242328).

Almost surely, 2^21101022201 is an apocalyptic number.

21101022201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21101022201 is a deficient number, since it is larger than the sum of its proper divisors (11052916423).

21101022201 is a wasteful number, since it uses less digits than its factorization.

21101022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004810591.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21101022201 its reverse (10222010112), we get a palindrome (31323032313).

The spelling of 21101022201 in words is "twenty-one billion, one hundred one million, twenty-two thousand, two hundred one".