21010122002 has 16 divisors (see below), whose sum is σ = 31717764000. Its totient is φ = 10437571872.

The previous prime is 21010121989. The next prime is 21010122011. The reversal of 21010122002 is 20022101012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1467374 + ... + 1481622.

It is an arithmetic number, because the mean of its divisors is an integer number (1982360250).

Almost surely, 2^21010122002 is an apocalyptic number.

21010122002 is a deficient number, since it is larger than the sum of its proper divisors (10707641998).

21010122002 is a wasteful number, since it uses less digits than its factorization.

21010122002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18937.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21010122002 its reverse (20022101012), we get a palindrome (41032223014).

It can be divided in two parts, 2101012 and 2002, that multiplied together give a palindrome (4206226024).

The spelling of 21010122002 in words is "twenty-one billion, ten million, one hundred twenty-two thousand, two".