21221021021010 has 128 divisors (see below), whose sum is σ = 54852234946560. Its totient is φ = 5241733195776.

The previous prime is 21221021020993. The next prime is 21221021021017. The reversal of 21221021021010 is 1012012012212.

It is a super-2 number, since 2×21221021021010² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21221021021017) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1162527 + ... + 6617666.

It is an arithmetic number, because the mean of its divisors is an integer number (428533085520).

Almost surely, 2^{21221021021010} is an apocalyptic number.

21221021021010 is an abundant number, since it is smaller than the sum of its proper divisors (33631213925550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221021021010 is a wasteful number, since it uses less digits than its factorization.

21221021021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7780352.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221021021010 its reverse (1012012012212), we get a palindrome (22233033033222).

The spelling of 21221021021010 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-one million, twenty-one thousand, ten".