20521001222 has 8 divisors (see below), whose sum is σ = 30783791856. Its totient is φ = 10259737272.

The previous prime is 20521001177. The next prime is 20521001231. The reversal of 20521001222 is 22210012502.

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

It is a super-2 number, since 2×20521001222² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20521001222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347453 + ... + 402200.

It is an arithmetic number, because the mean of its divisors is an integer number (3847973982).

Almost surely, 2^20521001222 is an apocalyptic number.

20521001222 is a deficient number, since it is larger than the sum of its proper divisors (10262790634).

20521001222 is a wasteful number, since it uses less digits than its factorization.

20521001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763342.

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 20521001222 its reverse (22210012502), we get a palindrome (42731013724).

The spelling of 20521001222 in words is "twenty billion, five hundred twenty-one million, one thousand, two hundred twenty-two".