21040350401 has 16 divisors (see below), whose sum is σ = 24307112448. Its totient is φ = 17839176000.

The previous prime is 21040350391. The next prime is 21040350433. The reversal of 21040350401 is 10405304012.

It is a cyclic number.

It is not a de Polignac number, because 21040350401 - 2¹⁴ = 21040334017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21040350451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 766331 + ... + 793311.

It is an arithmetic number, because the mean of its divisors is an integer number (1519194528).

Almost surely, 2^21040350401 is an apocalyptic number.

It is an amenable number.

21040350401 is a deficient number, since it is larger than the sum of its proper divisors (3266762047).

21040350401 is a wasteful number, since it uses less digits than its factorization.

21040350401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28192.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21040350401 its reverse (10405304012), we get a palindrome (31445654413).

The spelling of 21040350401 in words is "twenty-one billion, forty million, three hundred fifty thousand, four hundred one".