1012201220021 has 4 divisors (see below), whose sum is σ = 1012574590944. Its totient is φ = 1011827849100.

The previous prime is 1012201219993. The next prime is 1012201220039. The reversal of 1012201220021 is 1200221022101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012201220021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012201219978 and 1012201220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012201270021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186681395 + ... + 186686816.

It is an arithmetic number, because the mean of its divisors is an integer number (253143647736).

Almost surely, 2^{1012201220021} is an apocalyptic number.

It is an amenable number.

1012201220021 is a deficient number, since it is larger than the sum of its proper divisors (373370923).

1012201220021 is an equidigital number, since it uses as much as digits as its factorization.

1012201220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373370922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1012201220021 its reverse (1200221022101), we get a palindrome (2212422242122).

The spelling of 1012201220021 in words is "one trillion, twelve billion, two hundred one million, two hundred twenty thousand, twenty-one".