19141921 has 2 divisors, whose sum is σ = 19141922. Its totient is φ = 19141920.

The previous prime is 19141897. The next prime is 19141939. The reversal of 19141921 is 12914191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19140625 + 1296 = 4375^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 19141921 - 2²³ = 10753313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19141921.

It is not a weakly prime, because it can be changed into another prime (19141951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9570960 + 9570961.

It is an arithmetic number, because the mean of its divisors is an integer number (9570961).

Almost surely, 2^19141921 is an apocalyptic number.

It is an amenable number.

19141921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19141921 is an equidigital number, since it uses as much as digits as its factorization.

19141921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 28.

The square root of 19141921 is about 4375.1481117786. The cubic root of 19141921 is about 267.5029073548.

The spelling of 19141921 in words is "nineteen million, one hundred forty-one thousand, nine hundred twenty-one".