9420000021221 has 8 divisors (see below), whose sum is σ = 9605251786104. Its totient is φ = 9235026623680.

The previous prime is 9420000021209. The next prime is 9420000021241. The reversal of 9420000021221 is 1221200000249.

It can be written as a sum of positive squares in 4 ways, for example, as 5519276270596 + 3900723750625 = 2349314^2 + 1975025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9420000021221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9420000021241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69523490 + ... + 69658851.

It is an arithmetic number, because the mean of its divisors is an integer number (1200656473263).

Almost surely, 2^{9420000021221} is an apocalyptic number.

It is an amenable number.

9420000021221 is a deficient number, since it is larger than the sum of its proper divisors (185251764883).

9420000021221 is a wasteful number, since it uses less digits than its factorization.

9420000021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139183671.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 9420000021221 in words is "nine trillion, four hundred twenty billion, twenty-one thousand, two hundred twenty-one".