15722212212021 has 16 divisors (see below), whose sum is σ = 23957731344384. Its totient is φ = 8984093273904.

The previous prime is 15722212211969. The next prime is 15722212212043. The reversal of 15722212212021 is 12021221222751.

It is not a de Polignac number, because 15722212212021 - 2⁹ = 15722212211509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15722212212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15722212212521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7095916 + ... + 9044138.

It is an arithmetic number, because the mean of its divisors is an integer number (1497358209024).

Almost surely, 2^{15722212212021} is an apocalyptic number.

It is an amenable number.

15722212212021 is a deficient number, since it is larger than the sum of its proper divisors (8235519132363).

15722212212021 is a wasteful number, since it uses less digits than its factorization.

15722212212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332520.

The product of its (nonzero) digits is 4480, while the sum is 30.

Adding to 15722212212021 its reverse (12021221222751), we get a palindrome (27743433434772).

The spelling of 15722212212021 in words is "fifteen trillion, seven hundred twenty-two billion, two hundred twelve million, two hundred twelve thousand, twenty-one".