125223406621 has 4 divisors (see below), whose sum is σ = 128135578912. Its totient is φ = 122311234332.

The previous prime is 125223406603. The next prime is 125223406657. The reversal of 125223406621 is 126604322521.

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: 126604322521 = 1993 ⋅63524497.

It is a cyclic number.

It is not a de Polignac number, because 125223406621 - 2¹⁹ = 125222882333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125223406681) 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, 1456086081 + ... + 1456086166.

It is an arithmetic number, because the mean of its divisors is an integer number (32033894728).

Almost surely, 2^125223406621 is an apocalyptic number.

It is an amenable number.

125223406621 is a deficient number, since it is larger than the sum of its proper divisors (2912172291).

125223406621 is an equidigital number, since it uses as much as digits as its factorization.

125223406621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912172290.

The product of its (nonzero) digits is 34560, while the sum is 34.

It can be divided in two parts, 12522 and 3406621, that added together give a palindrome (3419143).

The spelling of 125223406621 in words is "one hundred twenty-five billion, two hundred twenty-three million, four hundred six thousand, six hundred twenty-one".