21123040030 has 32 divisors (see below), whose sum is σ = 38167516800. Its totient is φ = 8416811520.

The previous prime is 21123040021. The next prime is 21123040123. The reversal of 21123040030 is 3004032112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21123039986 and 21123040013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4628950 + ... + 4633510.

It is an arithmetic number, because the mean of its divisors is an integer number (1192734900).

Almost surely, 2^21123040030 is an apocalyptic number.

21123040030 is a deficient number, since it is larger than the sum of its proper divisors (17044476770).

21123040030 is a wasteful number, since it uses less digits than its factorization.

21123040030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6244.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21123040030 its reverse (3004032112), we get a palindrome (24127072142).

The spelling of 21123040030 in words is "twenty-one billion, one hundred twenty-three million, forty thousand, thirty".