10551520221 has 16 divisors (see below), whose sum is σ = 15358474560. Its totient is φ = 6390357120.

The previous prime is 10551520183. The next prime is 10551520261. The reversal of 10551520221 is 12202515501.

It is not a de Polignac number, because 10551520221 - 2⁷ = 10551520093 is a prime.

It is a super-2 number, since 2×10551520221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10551520191 and 10551520200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10551520261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64720 + ... + 159033.

It is an arithmetic number, because the mean of its divisors is an integer number (959904660).

Almost surely, 2^10551520221 is an apocalyptic number.

10551520221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10551520221 is a deficient number, since it is larger than the sum of its proper divisors (4806954339).

10551520221 is a wasteful number, since it uses less digits than its factorization.

10551520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225196.

The product of its (nonzero) digits is 1000, while the sum is 24.

The spelling of 10551520221 in words is "ten billion, five hundred fifty-one million, five hundred twenty thousand, two hundred twenty-one".