21202010001 has 12 divisors (see below), whose sum is σ = 30626407812. Its totient is φ = 14134081536.

The previous prime is 21202009999. The next prime is 21202010009. The reversal of 21202010001 is 10001020212.

It can be written as a sum of positive squares in 2 ways, for example, as 11707456401 + 9494553600 = 108201^2 + 97440^2 .

It is not a de Polignac number, because 21202010001 - 2¹ = 21202009999 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 (21202010009) 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, 336165 + ... + 394221.

It is an arithmetic number, because the mean of its divisors is an integer number (2552200651).

Almost surely, 2^21202010001 is an apocalyptic number.

It is an amenable number.

21202010001 is a deficient number, since it is larger than the sum of its proper divisors (9424397811).

21202010001 is a wasteful number, since it uses less digits than its factorization.

21202010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98640 (or 98637 counting only the distinct ones).

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

Adding to 21202010001 its reverse (10001020212), we get a palindrome (31203030213).

The spelling of 21202010001 in words is "twenty-one billion, two hundred two million, ten thousand, one".