1210010010021 has 24 divisors (see below), whose sum is σ = 1850661618624. Its totient is φ = 759198142080.

The previous prime is 1210010010017. The next prime is 1210010010031. The reversal of 1210010010021 is 1200100100121.

It is a happy number.

It is not a de Polignac number, because 1210010010021 - 2² = 1210010010017 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 = 1210010009985 and 1210010010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210010010031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5639376 + ... + 5850006.

It is an arithmetic number, because the mean of its divisors is an integer number (77110900776).

Almost surely, 2^{1210010010021} is an apocalyptic number.

It is an amenable number.

1210010010021 is a deficient number, since it is larger than the sum of its proper divisors (640651608603).

1210010010021 is a wasteful number, since it uses less digits than its factorization.

1210010010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248201 (or 248198 counting only the distinct ones).

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

Adding to 1210010010021 its reverse (1200100100121), we get a palindrome (2410110110142).

It can be divided in two parts, 12100100100 and 21, that added together give a palindrome (12100100121).

The spelling of 1210010010021 in words is "one trillion, two hundred ten billion, ten million, ten thousand, twenty-one".