201220121210021 has 8 divisors (see below), whose sum is σ = 203767590086400. Its totient is φ = 198672661802160.

The previous prime is 201220121209981. The next prime is 201220121210023. The reversal of 201220121210021 is 120012121022102.

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-201220121210021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220121210023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46838720 + ... + 50953958.

It is an arithmetic number, because the mean of its divisors is an integer number (25470948760800).

Almost surely, 2^{201220121210021} is an apocalyptic number.

It is an amenable number.

201220121210021 is a deficient number, since it is larger than the sum of its proper divisors (2547468876379).

201220121210021 is an equidigital number, since it uses as much as digits as its factorization.

201220121210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4734259.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201220121210021 its reverse (120012121022102), we get a palindrome (321232242232123).

The spelling of 201220121210021 in words is "two hundred one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".