21121020201 has 8 divisors (see below), whose sum is σ = 29817910944. Its totient is φ = 13252404800.

The previous prime is 21121020181. The next prime is 21121020203. The reversal of 21121020201 is 10202012112.

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 21121020201 - 2¹⁰ = 21121019177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21121020203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207068775 + ... + 207068876.

It is an arithmetic number, because the mean of its divisors is an integer number (3727238868).

Almost surely, 2^21121020201 is an apocalyptic number.

It is an amenable number.

21121020201 is a deficient number, since it is larger than the sum of its proper divisors (8696890743).

21121020201 is a wasteful number, since it uses less digits than its factorization.

21121020201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414137671.

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

Adding to 21121020201 its reverse (10202012112), we get a palindrome (31323032313).

It can be divided in two parts, 2112 and 1020201, that multiplied together give a palindrome (2154664512).

The spelling of 21121020201 in words is "twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred one".