10221000002021 has 4 divisors (see below), whose sum is σ = 10223674960044. Its totient is φ = 10218325044000.

The previous prime is 10221000002011. The next prime is 10221000002113. The reversal of 10221000002021 is 12020000012201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8153817429121 + 2067182572900 = 2855489^2 + 1437770^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221000002021 - 2⁶ = 10221000001957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10221000001993 and 10221000002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221000002011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1337473280 + ... + 1337480921.

It is an arithmetic number, because the mean of its divisors is an integer number (2555918740011).

Almost surely, 2^{10221000002021} is an apocalyptic number.

It is an amenable number.

10221000002021 is a deficient number, since it is larger than the sum of its proper divisors (2674958023).

10221000002021 is an equidigital number, since it uses as much as digits as its factorization.

10221000002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674958022.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10221000002021 its reverse (12020000012201), we get a palindrome (22241000014222).

The spelling of 10221000002021 in words is "ten trillion, two hundred twenty-one billion, two thousand, twenty-one".