21011004342 has 16 divisors (see below), whose sum is σ = 46691120880. Its totient is φ = 7003668096.

The previous prime is 21011004341. The next prime is 21011004349. The reversal of 21011004342 is 24340011012.

21011004342 is a `hidden beast` number, since 210 + 110 + 0 + 4 + 342 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011004341) 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, 194546283 + ... + 194546390.

It is an arithmetic number, because the mean of its divisors is an integer number (2918195055).

Almost surely, 2^21011004342 is an apocalyptic number.

21011004342 is an abundant number, since it is smaller than the sum of its proper divisors (25680116538).

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

21011004342 is a wasteful number, since it uses less digits than its factorization.

21011004342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389092684 (or 389092678 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21011004342 its reverse (24340011012), we get a palindrome (45351015354).

The spelling of 21011004342 in words is "twenty-one billion, eleven million, four thousand, three hundred forty-two".