21122001002 has 4 divisors (see below), whose sum is σ = 31683001506. Its totient is φ = 10561000500.

The previous prime is 21122000981. The next prime is 21122001007. The reversal of 21122001002 is 20010022112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21100758121 + 21242881 = 145261^2 + 4609^2 .

It is a super-2 number, since 2×21122001002² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122001007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280500249 + ... + 5280500252.

Almost surely, 2^21122001002 is an apocalyptic number.

21122001002 is a deficient number, since it is larger than the sum of its proper divisors (10561000504).

21122001002 is a wasteful number, since it uses less digits than its factorization.

21122001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561000503.

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

Adding to 21122001002 its reverse (20010022112), we get a palindrome (41132023114).

It can be divided in two parts, 2112 and 2001002, that multiplied together give a palindrome (4226116224).

The spelling of 21122001002 in words is "twenty-one billion, one hundred twenty-two million, one thousand, two".