1210211101021 has 16 divisors (see below), whose sum is σ = 1305365048064. Its totient is φ = 1115352229824.

The previous prime is 1210211100997. The next prime is 1210211101039. The reversal of 1210211101021 is 1201011120121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1210211101021 - 2²³ = 1210202712413 is a prime.

It is a super-2 number, since 2×1210211101021² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210211100992 and 1210211101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210211101081) 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, 55895820 + ... + 55917466.

It is an arithmetic number, because the mean of its divisors is an integer number (81585315504).

Almost surely, 2^{1210211101021} is an apocalyptic number.

It is an amenable number.

1210211101021 is a deficient number, since it is larger than the sum of its proper divisors (95153947043).

1210211101021 is a wasteful number, since it uses less digits than its factorization.

1210211101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28260.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1210211101021 its reverse (1201011120121), we get a palindrome (2411222221142).

The spelling of 1210211101021 in words is "one trillion, two hundred ten billion, two hundred eleven million, one hundred one thousand, twenty-one".