10021220001 has 12 divisors (see below), whose sum is σ = 15588564628. Its totient is φ = 6166904544.

The previous prime is 10021219987. The next prime is 10021220003. The reversal of 10021220001 is 10002212001.

It can be written as a sum of positive squares in 2 ways, for example, as 1102306401 + 8918913600 = 33201^2 + 94440^2 .

It is not a de Polignac number, because 10021220001 - 2⁵ = 10021219969 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (10021220003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42825610 + ... + 42825843.

Almost surely, 2^10021220001 is an apocalyptic number.

It is an amenable number.

10021220001 is a deficient number, since it is larger than the sum of its proper divisors (5567344627).

10021220001 is a wasteful number, since it uses less digits than its factorization.

10021220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85651472 (or 85651469 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10021220001 its reverse (10002212001), we get a palindrome (20023432002).

The spelling of 10021220001 in words is "ten billion, twenty-one million, two hundred twenty thousand, one".