1011210000021 has 32 divisors (see below), whose sum is σ = 1617539051520. Its totient is φ = 620658234432.

The previous prime is 1011210000007. The next prime is 1011210000061. The reversal of 1011210000021 is 1200000121101.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1011210000021 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1011209999958 and 1011210000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011210000061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3626586 + ... + 3895451.

It is an arithmetic number, because the mean of its divisors is an integer number (50548095360).

Almost surely, 2^{1011210000021} is an apocalyptic number.

It is an amenable number.

1011210000021 is a deficient number, since it is larger than the sum of its proper divisors (606329051499).

1011210000021 is a wasteful number, since it uses less digits than its factorization.

1011210000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7522442 (or 7522436 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1011210000021 its reverse (1200000121101), we get a palindrome (2211210121122).

The spelling of 1011210000021 in words is "one trillion, eleven billion, two hundred ten million, twenty-one", and thus it is an aban number.