7212321415891 has 16 divisors (see below), whose sum is σ = 7505443994400. Its totient is φ = 6922174190848.

The previous prime is 7212321415879. The next prime is 7212321415913. The reversal of 7212321415891 is 1985141232127.

It is a cyclic number.

It is not a de Polignac number, because 7212321415891 - 2³⁹ = 6662565602003 is a prime.

It is a super-2 number, since 2×7212321415891² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7212321415991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29674935 + ... + 29916991.

It is an arithmetic number, because the mean of its divisors is an integer number (469090249650).

Almost surely, 2^{7212321415891} is an apocalyptic number.

7212321415891 is a deficient number, since it is larger than the sum of its proper divisors (293122578509).

7212321415891 is a wasteful number, since it uses less digits than its factorization.

7212321415891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248198.

The product of its digits is 241920, while the sum is 46.

The spelling of 7212321415891 in words is "seven trillion, two hundred twelve billion, three hundred twenty-one million, four hundred fifteen thousand, eight hundred ninety-one".