20211021224 has 8 divisors (see below), whose sum is σ = 37895664810. Its totient is φ = 10105510608.

The previous prime is 20211021223. The next prime is 20211021253. The reversal of 20211021224 is 42212011202.

It can be written as a sum of positive squares in only one way, i.e., 12470188900 + 7740832324 = 111670^2 + 87982^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20211021223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1263188819 + ... + 1263188834.

Almost surely, 2^20211021224 is an apocalyptic number.

It is an amenable number.

20211021224 is a deficient number, since it is larger than the sum of its proper divisors (17684643586).

20211021224 is a wasteful number, since it uses less digits than its factorization.

20211021224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526377659 (or 2526377655 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20211021224 its reverse (42212011202), we get a palindrome (62423032426).

The spelling of 20211021224 in words is "twenty billion, two hundred eleven million, twenty-one thousand, two hundred twenty-four".