21985000002 has 48 divisors (see below), whose sum is σ = 54448954560. Its totient is φ = 6280285536.

The previous prime is 21984999983. The next prime is 21985000027. The reversal of 21985000002 is 20000058912.

It is a self number, because there is not a number n which added to its sum of digits gives 21985000002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 878353 + ... + 903035.

It is an arithmetic number, because the mean of its divisors is an integer number (1134353220).

Almost surely, 2^21985000002 is an apocalyptic number.

21985000002 is an abundant number, since it is smaller than the sum of its proper divisors (32463954558).

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

21985000002 is a wasteful number, since it uses less digits than its factorization.

21985000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31767 (or 31764 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 21985000002 its reverse (20000058912), we get a palindrome (41985058914).

The spelling of 21985000002 in words is "twenty-one billion, nine hundred eighty-five million, two", and thus it is an aban number.