20212121001 has 16 divisors (see below), whose sum is σ = 27620490240. Its totient is φ = 13139575680.

The previous prime is 20212120997. The next prime is 20212121009. The reversal of 20212121001 is 10012121202.

It is not a de Polignac number, because 20212121001 - 2² = 20212120997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20212121009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214776 + ... + 294198.

It is an arithmetic number, because the mean of its divisors is an integer number (1726280640).

Almost surely, 2^20212121001 is an apocalyptic number.

It is an amenable number.

20212121001 is a deficient number, since it is larger than the sum of its proper divisors (7408369239).

20212121001 is a wasteful number, since it uses less digits than its factorization.

20212121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81536.

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

Adding to 20212121001 its reverse (10012121202), we get a palindrome (30224242203).

The spelling of 20212121001 in words is "twenty billion, two hundred twelve million, one hundred twenty-one thousand, one".