21624004556242 has 32 divisors (see below), whose sum is σ = 35421106662144. Its totient is φ = 9818994182400.

The previous prime is 21624004556239. The next prime is 21624004556261. The reversal of 21624004556242 is 24265540042612.

It is a super-3 number, since 3×21624004556242³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97595368 + ... + 97816684.

It is an arithmetic number, because the mean of its divisors is an integer number (1106909583192).

Almost surely, 2^{21624004556242} is an apocalyptic number.

21624004556242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21624004556242 is a deficient number, since it is larger than the sum of its proper divisors (13797102105902).

21624004556242 is a wasteful number, since it uses less digits than its factorization.

21624004556242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225874.

The product of its (nonzero) digits is 921600, while the sum is 43.

Adding to 21624004556242 its reverse (24265540042612), we get a palindrome (45889544598854).

The spelling of 21624004556242 in words is "twenty-one trillion, six hundred twenty-four billion, four million, five hundred fifty-six thousand, two hundred forty-two".