123501420021 has 96 divisors (see below), whose sum is σ = 205163642880. Its totient is φ = 64508355072.

The previous prime is 123501419981. The next prime is 123501420043. The reversal of 123501420021 is 120024105321.

It is not a de Polignac number, because 123501420021 - 2⁶ = 123501419957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 123501420021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123501420121) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 147200320 + ... + 147201158.

It is an arithmetic number, because the mean of its divisors is an integer number (2137121280).

Almost surely, 2^123501420021 is an apocalyptic number.

It is an amenable number.

123501420021 is a deficient number, since it is larger than the sum of its proper divisors (81662222859).

123501420021 is a wasteful number, since it uses less digits than its factorization.

123501420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 123501420021 its reverse (120024105321), we get a palindrome (243525525342).

The spelling of 123501420021 in words is "one hundred twenty-three billion, five hundred one million, four hundred twenty thousand, twenty-one".