21121201132021 has 16 divisors (see below), whose sum is σ = 21419202760704. Its totient is φ = 20825289476784.

The previous prime is 21121201132019. The next prime is 21121201132039. The reversal of 21121201132021 is 12023110212112.

It is a cyclic number.

It is not a de Polignac number, because 21121201132021 - 2¹ = 21121201132019 is a prime.

It is a super-2 number, since 2×21121201132021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121201132021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121201132081) 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, 19217656 + ... + 20286958.

It is an arithmetic number, because the mean of its divisors is an integer number (1338700172544).

Almost surely, 2^{21121201132021} is an apocalyptic number.

It is an amenable number.

21121201132021 is a deficient number, since it is larger than the sum of its proper divisors (298001628683).

21121201132021 is a wasteful number, since it uses less digits than its factorization.

21121201132021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070280.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21121201132021 its reverse (12023110212112), we get a palindrome (33144311344133).

The spelling of 21121201132021 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred one million, one hundred thirty-two thousand, twenty-one".