212021000001 has 12 divisors (see below), whose sum is σ = 309062213460. Its totient is φ = 140050568160.

The previous prime is 212020999999. The next prime is 212021000017. The reversal of 212021000001 is 100000120212.

It can be written as a sum of positive squares in 2 ways, for example, as 140868104976 + 71152895025 = 375324^2 + 266745^2 .

It is not a de Polignac number, because 212021000001 - 2¹ = 212020999999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (212021000021) 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, 108062730 + ... + 108064691.

It is an arithmetic number, because the mean of its divisors is an integer number (25755184455).

Almost surely, 2^212021000001 is an apocalyptic number.

It is an amenable number.

212021000001 is a deficient number, since it is larger than the sum of its proper divisors (97041213459).

212021000001 is a wasteful number, since it uses less digits than its factorization.

212021000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216127536 (or 216127533 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 212021000001 its reverse (100000120212), we get a palindrome (312021120213).

The spelling of 212021000001 in words is "two hundred twelve billion, twenty-one million, one", and thus it is an aban number.