21837187542 has 16 divisors (see below), whose sum is σ = 43676398080. Its totient is φ = 7278725352.

The previous prime is 21837187523. The next prime is 21837187607. The reversal of 21837187542 is 24578173812.

It is a junction number, because it is equal to n+sod(n) for n = 21837187491 and 21837187500.

It is a congruent number.

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, 80959 + ... + 224117.

It is an arithmetic number, because the mean of its divisors is an integer number (2729774880).

Almost surely, 2^21837187542 is an apocalyptic number.

21837187542 is an abundant number, since it is smaller than the sum of its proper divisors (21839210538).

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

21837187542 is a wasteful number, since it uses less digits than its factorization.

21837187542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168587.

The product of its digits is 752640, while the sum is 48.

The spelling of 21837187542 in words is "twenty-one billion, eight hundred thirty-seven million, one hundred eighty-seven thousand, five hundred forty-two".