201212220021 has 8 divisors (see below), whose sum is σ = 272287183584. Its totient is φ = 132139368240.

The previous prime is 201212220019. The next prime is 201212220023. The reversal of 201212220021 is 120022212102.

It is an interprime number because it is at equal distance from previous prime (201212220019) and next prime (201212220023).

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

It is not a de Polignac number, because 201212220021 - 2¹ = 201212220019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212220023) 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, 500527710 + ... + 500528111.

It is an arithmetic number, because the mean of its divisors is an integer number (34035897948).

Almost surely, 2^201212220021 is an apocalyptic number.

It is an amenable number.

201212220021 is a deficient number, since it is larger than the sum of its proper divisors (71074963563).

201212220021 is a wasteful number, since it uses less digits than its factorization.

201212220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001055891.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 201212220021 its reverse (120022212102), we get a palindrome (321234432123).

The spelling of 201212220021 in words is "two hundred one billion, two hundred twelve million, two hundred twenty thousand, twenty-one".