21010002122002 has 4 divisors (see below), whose sum is σ = 31515003183006. Its totient is φ = 10505001061000.

The previous prime is 21010002121943. The next prime is 21010002122003. The reversal of 21010002122002 is 20022120001012.

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., 20977874785921 + 32127336081 = 4580161^2 + 179241^2 .

It is a super-3 number, since 3×21010002122002³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21010002122003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252500530499 + ... + 5252500530502.

Almost surely, 2^{21010002122002} is an apocalyptic number.

21010002122002 is a deficient number, since it is larger than the sum of its proper divisors (10505001061004).

21010002122002 is a wasteful number, since it uses less digits than its factorization.

21010002122002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505001061003.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21010002122002 its reverse (20022120001012), we get a palindrome (41032122123014).

The spelling of 21010002122002 in words is "twenty-one trillion, ten billion, two million, one hundred twenty-two thousand, two".