10202121199969 has 4 divisors (see below), whose sum is σ = 10202163929620. Its totient is φ = 10202078470320.

The previous prime is 10202121199901. The next prime is 10202121199979. The reversal of 10202121199969 is 96999112120201.

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 8922688745569 + 1279432454400 = 2987087^2 + 1131120^2 .

It is a cyclic number.

It is not a de Polignac number, because 10202121199969 - 2²³ = 10202112811361 is a prime.

It is a super-2 number, since 2×10202121199969² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10202121199979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21004662 + ... + 21484879.

It is an arithmetic number, because the mean of its divisors is an integer number (2550540982405).

Almost surely, 2^{10202121199969} is an apocalyptic number.

It is an amenable number.

10202121199969 is a deficient number, since it is larger than the sum of its proper divisors (42729651).

10202121199969 is an equidigital number, since it uses as much as digits as its factorization.

10202121199969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42729650.

The product of its (nonzero) digits is 314928, while the sum is 52.

The spelling of 10202121199969 in words is "ten trillion, two hundred two billion, one hundred twenty-one million, one hundred ninety-nine thousand, nine hundred sixty-nine".