21140401242 has 16 divisors (see below), whose sum is σ = 42691296960. Its totient is φ = 6978384672.

The previous prime is 21140401231. The next prime is 21140401253. The reversal of 21140401242 is 24210404112.

It is an interprime number because it is at equal distance from previous prime (21140401231) and next prime (21140401253).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17103267 + ... + 17104502.

It is an arithmetic number, because the mean of its divisors is an integer number (2668206060).

Almost surely, 2^21140401242 is an apocalyptic number.

21140401242 is an abundant number, since it is smaller than the sum of its proper divisors (21550895718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21140401242 is a wasteful number, since it uses less digits than its factorization.

21140401242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34207877.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21140401242 its reverse (24210404112), we get a palindrome (45350805354).

The spelling of 21140401242 in words is "twenty-one billion, one hundred forty million, four hundred one thousand, two hundred forty-two".