7188004010921 has 2 divisors, whose sum is σ = 7188004010922. Its totient is φ = 7188004010920.

The previous prime is 7188004010861. The next prime is 7188004011037. The reversal of 7188004010921 is 1290104008817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7187546521600 + 457489321 = 2680960^2 + 21389^2 .

It is a cyclic number.

It is not a de Polignac number, because 7188004010921 - 2¹⁴ = 7188003994537 is a prime.

It is a super-2 number, since 2×7188004010921² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7188004010021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3594002005460 + 3594002005461.

It is an arithmetic number, because the mean of its divisors is an integer number (3594002005461).

Almost surely, 2^{7188004010921} is an apocalyptic number.

It is an amenable number.

7188004010921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7188004010921 is an equidigital number, since it uses as much as digits as its factorization.

7188004010921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 41.

The spelling of 7188004010921 in words is "seven trillion, one hundred eighty-eight billion, four million, ten thousand, nine hundred twenty-one".