21011022224 has 10 divisors (see below), whose sum is σ = 40708855590. Its totient is φ = 10505511104.

The previous prime is 21011022217. The next prime is 21011022233. The reversal of 21011022224 is 42222011012.

It can be written as a sum of positive squares in only one way, i.e., 13011508624 + 7999513600 = 114068^2 + 89440^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656594429 + ... + 656594460.

It is an arithmetic number, because the mean of its divisors is an integer number (4070885559).

Almost surely, 2^21011022224 is an apocalyptic number.

It is an amenable number.

21011022224 is a deficient number, since it is larger than the sum of its proper divisors (19697833366).

21011022224 is a wasteful number, since it uses less digits than its factorization.

21011022224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313188897 (or 1313188891 counting only the distinct ones).

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

Adding to 21011022224 its reverse (42222011012), we get a palindrome (63233033236).

The spelling of 21011022224 in words is "twenty-one billion, eleven million, twenty-two thousand, two hundred twenty-four".