4021221012397 has 4 divisors (see below), whose sum is σ = 4021226894016. Its totient is φ = 4021215130780.

The previous prime is 4021221012383. The next prime is 4021221012427. The reversal of 4021221012397 is 7932101221204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4021221012397 - 2²³ = 4021212623789 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 (4021221012307) 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, 1756213 + ... + 3335674.

It is an arithmetic number, because the mean of its divisors is an integer number (1005306723504).

Almost surely, 2^{4021221012397} is an apocalyptic number.

It is an amenable number.

4021221012397 is a deficient number, since it is larger than the sum of its proper divisors (5881619).

4021221012397 is an equidigital number, since it uses as much as digits as its factorization.

4021221012397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5881618.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 4021221012397 in words is "four trillion, twenty-one billion, two hundred twenty-one million, twelve thousand, three hundred ninety-seven".