21502322541004 has 24 divisors (see below), whose sum is σ = 40814308070928. Its totient is φ = 9871941480960.

The previous prime is 21502322540971. The next prime is 21502322541031. The reversal of 21502322541004 is 40014522320512.

It is a happy number.

It is a super-2 number, since 2×21502322541004² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3856224354 + ... + 3856229929.

It is an arithmetic number, because the mean of its divisors is an integer number (1700596169622).

Almost surely, 2^{21502322541004} is an apocalyptic number.

It is an amenable number.

21502322541004 is a deficient number, since it is larger than the sum of its proper divisors (19311985529924).

21502322541004 is a wasteful number, since it uses less digits than its factorization.

21502322541004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7712454345 (or 7712454343 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21502322541004 its reverse (40014522320512), we get a palindrome (61516844861516).

The spelling of 21502322541004 in words is "twenty-one trillion, five hundred two billion, three hundred twenty-two million, five hundred forty-one thousand, four".