21121022201 has 8 divisors (see below), whose sum is σ = 21412975584. Its totient is φ = 20829961440.

The previous prime is 21121022189. The next prime is 21121022227. The reversal of 21121022201 is 10222012112.

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-21121022201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121022261) 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, 175436 + ... + 270221.

It is an arithmetic number, because the mean of its divisors is an integer number (2676621948).

Almost surely, 2^21121022201 is an apocalyptic number.

It is an amenable number.

21121022201 is a deficient number, since it is larger than the sum of its proper divisors (291953383).

21121022201 is an equidigital number, since it uses as much as digits as its factorization.

21121022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446311.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21121022201 its reverse (10222012112), we get a palindrome (31343034313).

It can be divided in two parts, 2112 and 1022201, that multiplied together give a palindrome (2158888512).

The spelling of 21121022201 in words is "twenty-one billion, one hundred twenty-one million, twenty-two thousand, two hundred one".