10261221012 has 288 divisors, whose sum is σ = 32969244672. Its totient is φ = 2621887488.

The previous prime is 10261220987. The next prime is 10261221017. The reversal of 10261221012 is 21012216201.

It is a super-2 number, since 2×10261221012² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10261221017) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21972403 + ... + 21972869.

It is an arithmetic number, because the mean of its divisors is an integer number (114476544).

Almost surely, 2^10261221012 is an apocalyptic number.

10261221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10261221012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16484622336).

10261221012 is an abundant number, since it is smaller than the sum of its proper divisors (22708023660).

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

10261221012 is a wasteful number, since it uses less digits than its factorization.

10261221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 10261221012 its reverse (21012216201), we get a palindrome (31273437213).

The spelling of 10261221012 in words is "ten billion, two hundred sixty-one million, two hundred twenty-one thousand, twelve".