21130023401 has 16 divisors (see below), whose sum is σ = 22498067520. Its totient is φ = 19776046080.

The previous prime is 21130023391. The next prime is 21130023403. The reversal of 21130023401 is 10432003112.

It is a cyclic number.

It is not a de Polignac number, because 21130023401 - 2⁶ = 21130023337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21130023401.

It is not an unprimeable number, because it can be changed into a prime (21130023403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6838865 + ... + 6841953.

It is an arithmetic number, because the mean of its divisors is an integer number (1406129220).

Almost surely, 2^21130023401 is an apocalyptic number.

It is an amenable number.

21130023401 is a deficient number, since it is larger than the sum of its proper divisors (1368044119).

21130023401 is a wasteful number, since it uses less digits than its factorization.

21130023401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5224.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21130023401 its reverse (10432003112), we get a palindrome (31562026513).

The spelling of 21130023401 in words is "twenty-one billion, one hundred thirty million, twenty-three thousand, four hundred one".