21216223653202 has 4 divisors (see below), whose sum is σ = 31824335479806. Its totient is φ = 10608111826600.

The previous prime is 21216223653151. The next prime is 21216223653239. The reversal of 21216223653202 is 20235632261212.

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., 15114281268681 + 6101942384521 = 3887709^2 + 2470211^2 .

It is a super-3 number, since 3×21216223653202³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5304055913299 + ... + 5304055913302.

Almost surely, 2^{21216223653202} is an apocalyptic number.

21216223653202 is a deficient number, since it is larger than the sum of its proper divisors (10608111826604).

21216223653202 is a wasteful number, since it uses less digits than its factorization.

21216223653202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10608111826603.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 21216223653202 in words is "twenty-one trillion, two hundred sixteen billion, two hundred twenty-three million, six hundred fifty-three thousand, two hundred two".