21010162802 has 4 divisors (see below), whose sum is σ = 31515244206. Its totient is φ = 10505081400.

The previous prime is 21010162763. The next prime is 21010162813. The reversal of 21010162802 is 20826101012.

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., 18596504161 + 2413658641 = 136369^2 + 49129^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252540699 + ... + 5252540702.

Almost surely, 2^21010162802 is an apocalyptic number.

21010162802 is a deficient number, since it is larger than the sum of its proper divisors (10505081404).

21010162802 is a wasteful number, since it uses less digits than its factorization.

21010162802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505081403.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21010162802 its reverse (20826101012), we get a palindrome (41836263814).

The spelling of 21010162802 in words is "twenty-one billion, ten million, one hundred sixty-two thousand, eight hundred two".