21221546646002 has 4 divisors (see below), whose sum is σ = 31832319969006. Its totient is φ = 10610773323000.

The previous prime is 21221546645951. The next prime is 21221546646019. The reversal of 21221546646002 is 20064664512212.

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., 19346265636721 + 1875281009281 = 4398439^2 + 1369409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305386661499 + ... + 5305386661502.

Almost surely, 2^{21221546646002} is an apocalyptic number.

21221546646002 is a deficient number, since it is larger than the sum of its proper divisors (10610773323004).

21221546646002 is a wasteful number, since it uses less digits than its factorization.

21221546646002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610773323003.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 21221546646002 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred forty-six million, six hundred forty-six thousand, two".