21101220002 has 16 divisors (see below), whose sum is σ = 31904293824. Its totient is φ = 10466778000.

The previous prime is 21101220001. The next prime is 21101220017. The reversal of 21101220002 is 20002210112.

It is a happy number.

It is a super-2 number, since 2×21101220002² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21101220001) 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, 50852 + ... + 211632.

It is an arithmetic number, because the mean of its divisors is an integer number (1994018364).

Almost surely, 2^21101220002 is an apocalyptic number.

21101220002 is a deficient number, since it is larger than the sum of its proper divisors (10803073822).

21101220002 is a wasteful number, since it uses less digits than its factorization.

21101220002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161305.

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

Adding to 21101220002 its reverse (20002210112), we get a palindrome (41103430114).

The spelling of 21101220002 in words is "twenty-one billion, one hundred one million, two hundred twenty thousand, two".