1012120021 has 8 divisors (see below), whose sum is σ = 1112076000. Its totient is φ = 913488240.

The previous prime is 1012120003. The next prime is 1012120027. The reversal of 1012120021 is 1200212101.

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 1012120021 - 2¹³ = 1012111829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012120027) 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, 329446 + ... + 332503.

It is an arithmetic number, because the mean of its divisors is an integer number (139009500).

Almost surely, 2^1012120021 is an apocalyptic number.

1012120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1012120021 is a deficient number, since it is larger than the sum of its proper divisors (99955979).

1012120021 is a wasteful number, since it uses less digits than its factorization.

1012120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662099.

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

The square root of 1012120021 is about 31813.8337991510. The cubic root of 1012120021 is about 1004.0237943626.

Adding to 1012120021 its reverse (1200212101), we get a palindrome (2212332122).

The spelling of 1012120021 in words is "one billion, twelve million, one hundred twenty thousand, twenty-one".