21576472450642 has 16 divisors (see below), whose sum is σ = 34081703599680. Its totient is φ = 10224511075152.

The previous prime is 21576472450609. The next prime is 21576472450649. The reversal of 21576472450642 is 24605427467512.

It is a super-4 number, since 4×21576472450642⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is not an unprimeable number, because it can be changed into a prime (21576472450649) 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, 2151617688 + ... + 2151627715.

It is an arithmetic number, because the mean of its divisors is an integer number (2130106474980).

Almost surely, 2^{21576472450642} is an apocalyptic number.

21576472450642 is a deficient number, since it is larger than the sum of its proper divisors (12505231149038).

21576472450642 is a wasteful number, since it uses less digits than its factorization.

21576472450642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4303245537.

The product of its (nonzero) digits is 22579200, while the sum is 55.

The spelling of 21576472450642 in words is "twenty-one trillion, five hundred seventy-six billion, four hundred seventy-two million, four hundred fifty thousand, six hundred forty-two".