21150204522544 has 40 divisors (see below), whose sum is σ = 41829057402912. Its totient is φ = 10357097157120.

The previous prime is 21150204522529. The next prime is 21150204522547. The reversal of 21150204522544 is 44522540205112.

It is not an unprimeable number, because it can be changed into a prime (21150204522547) 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, 46275364 + ... + 46730179.

Almost surely, 2^{21150204522544} is an apocalyptic number.

It is an amenable number.

21150204522544 is a deficient number, since it is larger than the sum of its proper divisors (20678852880368).

21150204522544 is a wasteful number, since it uses less digits than its factorization.

21150204522544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93005845 (or 93005839 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 37.

Adding to 21150204522544 its reverse (44522540205112), we get a palindrome (65672744727656).

The spelling of 21150204522544 in words is "twenty-one trillion, one hundred fifty billion, two hundred four million, five hundred twenty-two thousand, five hundred forty-four".