21466121002 has 4 divisors (see below), whose sum is σ = 32199181506. Its totient is φ = 10733060500.

The previous prime is 21466120997. The next prime is 21466121009. The reversal of 21466121002 is 20012166412.

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., 14993757601 + 6472363401 = 122449^2 + 80451^2 .

It is not an unprimeable number, because it can be changed into a prime (21466121009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5366530249 + ... + 5366530252.

Almost surely, 2^21466121002 is an apocalyptic number.

21466121002 is a deficient number, since it is larger than the sum of its proper divisors (10733060504).

21466121002 is a wasteful number, since it uses less digits than its factorization.

21466121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10733060503.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 21466121002 its reverse (20012166412), we get a palindrome (41478287414).

The spelling of 21466121002 in words is "twenty-one billion, four hundred sixty-six million, one hundred twenty-one thousand, two".