102054021 has 4 divisors (see below), whose sum is σ = 136072032. Its totient is φ = 68036012.

The previous prime is 102054019. The next prime is 102054023. The reversal of 102054021 is 120450201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120450201 = 3 ⋅40150067.

It is an interprime number because it is at equal distance from previous prime (102054019) and next prime (102054023).

It is a cyclic number.

It is not a de Polignac number, because 102054021 - 2¹ = 102054019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102054023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17009001 + ... + 17009006.

It is an arithmetic number, because the mean of its divisors is an integer number (34018008).

Almost surely, 2^102054021 is an apocalyptic number.

It is an amenable number.

102054021 is a deficient number, since it is larger than the sum of its proper divisors (34018011).

102054021 is an equidigital number, since it uses as much as digits as its factorization.

102054021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34018010.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 102054021 is about 10102.1790223694. The cubic root of 102054021 is about 467.3153432029.

The spelling of 102054021 in words is "one hundred two million, fifty-four thousand, twenty-one".