21020000121002 has 8 divisors (see below), whose sum is σ = 31665322071396. Its totient is φ = 10464892763872.

The previous prime is 21020000120983. The next prime is 21020000121007. The reversal of 21020000121002 is 20012100002012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16601297631961 + 4418702489041 = 4074469^2 + 2102071^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21020000121007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22553647733 + ... + 22553648664.

Almost surely, 2^{21020000121002} is an apocalyptic number.

21020000121002 is a deficient number, since it is larger than the sum of its proper divisors (10645321950394).

21020000121002 is a wasteful number, since it uses less digits than its factorization.

21020000121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45107296632.

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

Adding to 21020000121002 its reverse (20012100002012), we get a palindrome (41032100123014).

The spelling of 21020000121002 in words is "twenty-one trillion, twenty billion, one hundred twenty-one thousand, two".