21201102002 has 4 divisors (see below), whose sum is σ = 31801653006. Its totient is φ = 10600551000.

The previous prime is 21201101983. The next prime is 21201102011. The reversal of 21201102002 is 20020110212.

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., 20532310681 + 668791321 = 143291^2 + 25861^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300275499 + ... + 5300275502.

Almost surely, 2^21201102002 is an apocalyptic number.

21201102002 is a deficient number, since it is larger than the sum of its proper divisors (10600551004).

21201102002 is a wasteful number, since it uses less digits than its factorization.

21201102002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10600551003.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21201102002 its reverse (20020110212), we get a palindrome (41221212214).

The spelling of 21201102002 in words is "twenty-one billion, two hundred one million, one hundred two thousand, two".