211421401397 has 4 divisors (see below), whose sum is σ = 215004815040. Its totient is φ = 207837987756.

The previous prime is 211421401333. The next prime is 211421401423. The reversal of 211421401397 is 793104124112.

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 211421401397 - 2⁶ = 211421401333 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 (211421401327) 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, 1791706733 + ... + 1791706850.

It is an arithmetic number, because the mean of its divisors is an integer number (53751203760).

Almost surely, 2^211421401397 is an apocalyptic number.

It is an amenable number.

211421401397 is a deficient number, since it is larger than the sum of its proper divisors (3583413643).

211421401397 is an equidigital number, since it uses as much as digits as its factorization.

211421401397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583413642.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 211421401397 in words is "two hundred eleven billion, four hundred twenty-one million, four hundred one thousand, three hundred ninety-seven".