20221213155 has 64 divisors (see below), whose sum is σ = 38402477568. Its totient is φ = 8956661760.

The previous prime is 20221213151. The next prime is 20221213217. The reversal of 20221213155 is 55131212202.

It is not a de Polignac number, because 20221213155 - 2² = 20221213151 is a prime.

It is a super-2 number, since 2×20221213155² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20221213151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 159472 + ... + 256658.

It is an arithmetic number, because the mean of its divisors is an integer number (600038712).

Almost surely, 2^20221213155 is an apocalyptic number.

20221213155 is a deficient number, since it is larger than the sum of its proper divisors (18181264413).

20221213155 is a wasteful number, since it uses less digits than its factorization.

20221213155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97316.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 20221213155 its reverse (55131212202), we get a palindrome (75352425357).

The spelling of 20221213155 in words is "twenty billion, two hundred twenty-one million, two hundred thirteen thousand, one hundred fifty-five".