21161003712 has 56 divisors (see below), whose sum is σ = 56016601200. Its totient is φ = 7050126336.

The previous prime is 21161003701. The next prime is 21161003719. The reversal of 21161003712 is 21730016112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21161003719) 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, 370614 + ... + 423882.

It is an arithmetic number, because the mean of its divisors is an integer number (1000296450).

Almost surely, 2^21161003712 is an apocalyptic number.

It is an amenable number.

21161003712 is an abundant number, since it is smaller than the sum of its proper divisors (34855597488).

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

21161003712 is a wasteful number, since it uses less digits than its factorization.

21161003712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55353 (or 55343 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

Adding to 21161003712 its reverse (21730016112), we get a palindrome (42891019824).

The spelling of 21161003712 in words is "twenty-one billion, one hundred sixty-one million, three thousand, seven hundred twelve".