21040400122 has 16 divisors (see below), whose sum is σ = 36088217280. Its totient is φ = 9012574368.

The previous prime is 21040400119. The next prime is 21040400123. The reversal of 21040400122 is 22100404012.

It is a super-3 number, since 3×21040400122³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21040400096 and 21040400105.

It is not an unprimeable number, because it can be changed into a prime (21040400123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367347 + ... + 420742.

It is an arithmetic number, because the mean of its divisors is an integer number (2255513580).

Almost surely, 2^21040400122 is an apocalyptic number.

21040400122 is a deficient number, since it is larger than the sum of its proper divisors (15047817158).

21040400122 is a wasteful number, since it uses less digits than its factorization.

21040400122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790005.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21040400122 its reverse (22100404012), we get a palindrome (43140804134).

The spelling of 21040400122 in words is "twenty-one billion, forty million, four hundred thousand, one hundred twenty-two".