21110020002 has 12 divisors (see below), whose sum is σ = 45738376710. Its totient is φ = 7036673328.

The previous prime is 21110019979. The next prime is 21110020013. The reversal of 21110020002 is 20002001112.

It can be written as a sum of positive squares in only one way, i.e., 19091225241 + 2018794761 = 138171^2 + 44931^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586389427 + ... + 586389462.

Almost surely, 2^21110020002 is an apocalyptic number.

21110020002 is an abundant number, since it is smaller than the sum of its proper divisors (24628356708).

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

21110020002 is a wasteful number, since it uses less digits than its factorization.

21110020002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172778897 (or 1172778894 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21110020002 its reverse (20002001112), we get a palindrome (41112021114).

The spelling of 21110020002 in words is "twenty-one billion, one hundred ten million, twenty thousand, two".