21150036122564 has 12 divisors (see below), whose sum is σ = 37012599175104. Its totient is φ = 10575007786824.

The previous prime is 21150036122561. The next prime is 21150036122587. The reversal of 21150036122564 is 46522163005112.

It is not an unprimeable number, because it can be changed into a prime (21150036122561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3839129 + ... + 7552415.

It is an arithmetic number, because the mean of its divisors is an integer number (3084383264592).

Almost surely, 2^{21150036122564} is an apocalyptic number.

It is an amenable number.

21150036122564 is a deficient number, since it is larger than the sum of its proper divisors (15862563052540).

21150036122564 is a wasteful number, since it uses less digits than its factorization.

21150036122564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5137234 (or 5137232 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 21150036122564 its reverse (46522163005112), we get a palindrome (67672199127676).

The spelling of 21150036122564 in words is "twenty-one trillion, one hundred fifty billion, thirty-six million, one hundred twenty-two thousand, five hundred sixty-four".