102021919 has 2 divisors, whose sum is σ = 102021920. Its totient is φ = 102021918.

The previous prime is 102021911. The next prime is 102021977. The reversal of 102021919 is 919120201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102021919 - 2³ = 102021911 is a prime.

It is a super-2 number, since 2×102021919² = 20816943912885122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102021893 and 102021902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010959 + 51010960.

It is an arithmetic number, because the mean of its divisors is an integer number (51010960).

Almost surely, 2^102021919 is an apocalyptic number.

102021919 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021919 is an equidigital number, since it uses as much as digits as its factorization.

102021919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 102021919 is about 10100.5900322704. The cubic root of 102021919 is about 467.2663386651.

It can be divided in two parts, 10202 and 1919, that added together give a palindrome (12121).

The spelling of 102021919 in words is "one hundred two million, twenty-one thousand, nine hundred nineteen".