21210440302 has 4 divisors (see below), whose sum is σ = 31815660456. Its totient is φ = 10605220150.

The previous prime is 21210440267. The next prime is 21210440309. The reversal of 21210440302 is 20304401212.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21210440302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210440309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302610074 + ... + 5302610077.

It is an arithmetic number, because the mean of its divisors is an integer number (7953915114).

Almost surely, 2^21210440302 is an apocalyptic number.

21210440302 is a deficient number, since it is larger than the sum of its proper divisors (10605220154).

21210440302 is a wasteful number, since it uses less digits than its factorization.

21210440302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605220153.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21210440302 its reverse (20304401212), we get a palindrome (41514841514).

The spelling of 21210440302 in words is "twenty-one billion, two hundred ten million, four hundred forty thousand, three hundred two".