21030012112021 has 16 divisors (see below), whose sum is σ = 23751485337600. Its totient is φ = 18444512116800.

The previous prime is 21030012112019. The next prime is 21030012112093. The reversal of 21030012112021 is 12021121003012.

It is not a de Polignac number, because 21030012112021 - 2¹ = 21030012112019 is a prime.

It is a super-2 number, since 2×21030012112021² (a number of 27 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 = 21030012111986 and 21030012112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030012113021) 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, 25364010 + ... + 26180011.

It is an arithmetic number, because the mean of its divisors is an integer number (1484467833600).

Almost surely, 2^{21030012112021} is an apocalyptic number.

It is an amenable number.

21030012112021 is a deficient number, since it is larger than the sum of its proper divisors (2721473225579).

21030012112021 is a wasteful number, since it uses less digits than its factorization.

21030012112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51545340.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21030012112021 its reverse (12021121003012), we get a palindrome (33051133115033).

It can be divided in two parts, 210300 and 12112021, that added together give a palindrome (12322321).

The spelling of 21030012112021 in words is "twenty-one trillion, thirty billion, twelve million, one hundred twelve thousand, twenty-one".