21011122222002 has 80 divisors (see below), whose sum is σ = 51367987088352. Its totient is φ = 6366081185280.

The previous prime is 21011122221923. The next prime is 21011122222009. The reversal of 21011122222002 is 20022222111012.

It is a happy number.

21011122222002 is a `hidden beast` number, since 210 + 1 + 11 + 222 + 220 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21011122222009) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11454738 + ... + 13161810.

Almost surely, 2^{21011122222002} is an apocalyptic number.

21011122222002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21011122222002 is an abundant number, since it is smaller than the sum of its proper divisors (30356864866350).

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

21011122222002 is a wasteful number, since it uses less digits than its factorization.

21011122222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714005 (or 1713996 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21011122222002 its reverse (20022222111012), we get a palindrome (41033344333014).

The spelling of 21011122222002 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, two".