10001001011220 has 96 divisors (see below), whose sum is σ = 31188131600640. Its totient is φ = 2660598783360.

The previous prime is 10001001011153. The next prime is 10001001011233. The reversal of 10001001011220 is 2211010010001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21768352 + ... + 22223031.

It is an arithmetic number, because the mean of its divisors is an integer number (324876370840).

Almost surely, 2^{10001001011220} is an apocalyptic number.

10001001011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001001011220 is an abundant number, since it is smaller than the sum of its proper divisors (21187130589420).

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

10001001011220 is a wasteful number, since it uses less digits than its factorization.

10001001011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43991822 (or 43991814 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10001001011220 its reverse (2211010010001), we get a palindrome (12212011021221).

The spelling of 10001001011220 in words is "ten trillion, one billion, one million, eleven thousand, two hundred twenty".