21220210015 has 8 divisors (see below), whose sum is σ = 25482155328. Its totient is φ = 16964232480.

The previous prime is 21220210009. The next prime is 21220210027. The reversal of 21220210015 is 51001202212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220210015 - 2³ = 21220210007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1484116 + ... + 1498345.

It is an arithmetic number, because the mean of its divisors is an integer number (3185269416).

Almost surely, 2^21220210015 is an apocalyptic number.

21220210015 is a deficient number, since it is larger than the sum of its proper divisors (4261945313).

21220210015 is a wasteful number, since it uses less digits than its factorization.

21220210015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983889.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21220210015 its reverse (51001202212), we get a palindrome (72221412227).

The spelling of 21220210015 in words is "twenty-one billion, two hundred twenty million, two hundred ten thousand, fifteen".