10221199953421 has 2 divisors, whose sum is σ = 10221199953422. Its totient is φ = 10221199953420.

The previous prime is 10221199953413. The next prime is 10221199953499. The reversal of 10221199953421 is 12435999112201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8649398652196 + 1571801301225 = 2940986^2 + 1253715^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221199953421 - 2³ = 10221199953413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10221199953401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110599976710 + 5110599976711.

It is an arithmetic number, because the mean of its divisors is an integer number (5110599976711).

Almost surely, 2^{10221199953421} is an apocalyptic number.

It is an amenable number.

10221199953421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221199953421 is an equidigital number, since it uses as much as digits as its factorization.

10221199953421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 49.

The spelling of 10221199953421 in words is "ten trillion, two hundred twenty-one billion, one hundred ninety-nine million, nine hundred fifty-three thousand, four hundred twenty-one".