21023121002 has 8 divisors (see below), whose sum is σ = 33960426276. Its totient is φ = 9702978912.

The previous prime is 21023121001. The next prime is 21023121037. The reversal of 21023121002 is 20012132012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16905460441 + 4117660561 = 130021^2 + 64169^2 .

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 (21023121001) 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, 404290763 + ... + 404290814.

Almost surely, 2^21023121002 is an apocalyptic number.

21023121002 is a deficient number, since it is larger than the sum of its proper divisors (12937305274).

21023121002 is a wasteful number, since it uses less digits than its factorization.

21023121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808581592.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21023121002 its reverse (20012132012), we get a palindrome (41035253014).

The spelling of 21023121002 in words is "twenty-one billion, twenty-three million, one hundred twenty-one thousand, two".