123525021 has 4 divisors (see below), whose sum is σ = 164700032.
Its totient is φ = 82350012.
The previous prime is 123524993. The next prime is 123525029. The reversal of 123525021 is 120525321.
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.
It is not a de Polignac number, because 123525021 - 215 = 123492253 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (123525029) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20587501 + ... + 20587506.
It is an arithmetic number, because the mean of its divisors is an integer number (41175008).
Almost surely, 2123525021 is an apocalyptic number.
It is an amenable number.
123525021 is a deficient number, since it is larger than the sum of its proper divisors (41175011).
123525021 is an equidigital number, since it uses as much as digits as its factorization.
123525021 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 41175010.
The product of its (nonzero) digits is 600, while the sum is 21.
The square root of 123525021 is about 11114.1810764446.
The cubic root of 123525021 is about 498.0255748870.
The spelling of 123525021 in words is "one hundred twenty-three million, five hundred twenty-five thousand, twenty-one".