21500030142 has 12 divisors (see below), whose sum is σ = 46583398680. Its totient is φ = 7166676708.

The previous prime is 21500030141. The next prime is 21500030213. The reversal of 21500030142 is 24103000512.

21500030142 is a `hidden beast` number, since 21 + 500 + 0 + 3 + 0 + 142 = 666.

It is a super-2 number, since 2×21500030142² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1194446119 = 21500030142 / (2 + 1 + 5 + 0 + 0 + 0 + 3 + 0 + 1 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500030141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 597223042 + ... + 597223077.

It is an arithmetic number, because the mean of its divisors is an integer number (3881949890).

Almost surely, 2^21500030142 is an apocalyptic number.

21500030142 is an abundant number, since it is smaller than the sum of its proper divisors (25083368538).

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

21500030142 is a wasteful number, since it uses less digits than its factorization.

21500030142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194446127 (or 1194446124 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 21500030142 its reverse (24103000512), we get a palindrome (45603030654).

The spelling of 21500030142 in words is "twenty-one billion, five hundred million, thirty thousand, one hundred forty-two".