21150162454656 has 256 divisors, whose sum is σ = 58399088584320. Its totient is φ = 6776524800000.

The previous prime is 21150162454643. The next prime is 21150162454699. The reversal of 21150162454656 is 65645426105112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 655782531 + ... + 655814781.

Almost surely, 2^{21150162454656} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21150162454656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29199544292160).

21150162454656 is an abundant number, since it is smaller than the sum of its proper divisors (37248926129664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21150162454656 is a wasteful number, since it uses less digits than its factorization.

21150162454656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32863 (or 32851 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 48.

Adding to 21150162454656 its reverse (65645426105112), we get a palindrome (86795588559768).

The spelling of 21150162454656 in words is "twenty-one trillion, one hundred fifty billion, one hundred sixty-two million, four hundred fifty-four thousand, six hundred fifty-six".