10121221010 has 16 divisors (see below), whose sum is σ = 18237657816. Its totient is φ = 4044163968.

The previous prime is 10121221003. The next prime is 10121221013. The reversal of 10121221010 is 1012212101.

It can be written as a sum of positive squares in 4 ways, for example, as 5458106641 + 4663114369 = 73879^2 + 68287^2 .

It is a super-2 number, since 2×10121221010² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10121220982 and 10121221000.

It is not an unprimeable number, because it can be changed into a prime (10121221013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 530717 + ... + 549456.

Almost surely, 2^10121221010 is an apocalyptic number.

10121221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10121221010 is a deficient number, since it is larger than the sum of its proper divisors (8116436806).

10121221010 is a wasteful number, since it uses less digits than its factorization.

10121221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081117.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10121221010 its reverse (1012212101), we get a palindrome (11133433111).

The spelling of 10121221010 in words is "ten billion, one hundred twenty-one million, two hundred twenty-one thousand, ten".