1220011000021 has 8 divisors (see below), whose sum is σ = 1331616838464. Its totient is φ = 1108521119520.

The previous prime is 1220010999979. The next prime is 1220011000049. The reversal of 1220011000021 is 1200001100221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220011000021 - 2³⁵ = 1185651261653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220010999971 and 1220011000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220011000051) 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, 28967481 + ... + 29009566.

It is an arithmetic number, because the mean of its divisors is an integer number (166452104808).

Almost surely, 2^{1220011000021} is an apocalyptic number.

1220011000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220011000021 is a deficient number, since it is larger than the sum of its proper divisors (111605838443).

1220011000021 is a wasteful number, since it uses less digits than its factorization.

1220011000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57978971.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1220011000021 its reverse (1200001100221), we get a palindrome (2420012100242).

The spelling of 1220011000021 in words is "one trillion, two hundred twenty billion, eleven million, twenty-one", and thus it is an aban number.