1210002120021 has 16 divisors (see below), whose sum is σ = 1683886974336. Its totient is φ = 771409579776.

The previous prime is 1210002120001. The next prime is 1210002120053. The reversal of 1210002120021 is 1200212000121.

It is not a de Polignac number, because 1210002120021 - 2²⁶ = 1209935011157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210002119979 and 1210002120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210002120001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1824720 + ... + 2397833.

It is an arithmetic number, because the mean of its divisors is an integer number (105242935896).

Almost surely, 2^{1210002120021} is an apocalyptic number.

It is an amenable number.

1210002120021 is a deficient number, since it is larger than the sum of its proper divisors (473884854315).

1210002120021 is a wasteful number, since it uses less digits than its factorization.

1210002120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4226732.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1210002120021 its reverse (1200212000121), we get a palindrome (2410214120142).

The spelling of 1210002120021 in words is "one trillion, two hundred ten billion, two million, one hundred twenty thousand, twenty-one".