210021011012021 has 16 divisors (see below), whose sum is σ = 229817945419776. Its totient is φ = 190341489030000.

The previous prime is 210021011012011. The next prime is 210021011012027. The reversal of 210021011012021 is 120210110120012.

It is a de Polignac number, because none of the positive numbers 2^k-210021011012021 is a prime.

It is a super-2 number, since 2×210021011012021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021011011987 and 210021011012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021011012027) 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, 69115286 + ... + 72089976.

It is an arithmetic number, because the mean of its divisors is an integer number (14363621588736).

Almost surely, 2^{210021011012021} is an apocalyptic number.

It is an amenable number.

210021011012021 is a deficient number, since it is larger than the sum of its proper divisors (19796934407755).

210021011012021 is a wasteful number, since it uses less digits than its factorization.

210021011012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994424.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210021011012021 its reverse (120210110120012), we get a palindrome (330231121132033).

The spelling of 210021011012021 in words is "two hundred ten trillion, twenty-one billion, eleven million, twelve thousand, twenty-one".