20212941221 has 12 divisors (see below), whose sum is σ = 22246524300. Its totient is φ = 18351421440.

The previous prime is 20212941173. The next prime is 20212941257. The reversal of 20212941221 is 12214921202.

It can be written as a sum of positive squares in 2 ways, for example, as 3336333121 + 16876608100 = 57761^2 + 129910^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20212941221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212971221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15566 + ... + 201663.

It is an arithmetic number, because the mean of its divisors is an integer number (1853877025).

Almost surely, 2^20212941221 is an apocalyptic number.

It is an amenable number.

20212941221 is a deficient number, since it is larger than the sum of its proper divisors (2033583079).

20212941221 is a wasteful number, since it uses less digits than its factorization.

20212941221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218020 (or 218009 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 20212941221 in words is "twenty billion, two hundred twelve million, nine hundred forty-one thousand, two hundred twenty-one".