10221212012021 has 4 divisors (see below), whose sum is σ = 10822459777452. Its totient is φ = 9619964246592.

The previous prime is 10221212011979. The next prime is 10221212012023. The reversal of 10221212012021 is 12021021212201.

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 7842738639121 + 2378473372900 = 2800489^2 + 1542230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10221212012021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 601247765413 = 10221212012021 / (1 + 0 + 2 + 2 + 1 + 2 + 1 + 2 + 0 + 1 + 2 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221212012023) 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, 300623882690 + ... + 300623882723.

It is an arithmetic number, because the mean of its divisors is an integer number (2705614944363).

Almost surely, 2^{10221212012021} is an apocalyptic number.

It is an amenable number.

10221212012021 is a deficient number, since it is larger than the sum of its proper divisors (601247765431).

10221212012021 is an equidigital number, since it uses as much as digits as its factorization.

10221212012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601247765430.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 10221212012021 its reverse (12021021212201), we get a palindrome (22242233224222).

The spelling of 10221212012021 in words is "ten trillion, two hundred twenty-one billion, two hundred twelve million, twelve thousand, twenty-one".