21035277021 has 16 divisors (see below), whose sum is σ = 31115358720. Its totient is φ = 12532572720.

The previous prime is 21035277019. The next prime is 21035277023. The reversal of 21035277021 is 12077253012.

It is an interprime number because it is at equal distance from previous prime (21035277019) and next prime (21035277023).

It is not a de Polignac number, because 21035277021 - 2¹ = 21035277019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21035277021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035277023) 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, 5400025 + ... + 5403918.

It is an arithmetic number, because the mean of its divisors is an integer number (1944709920).

Almost surely, 2^21035277021 is an apocalyptic number.

It is an amenable number.

21035277021 is a deficient number, since it is larger than the sum of its proper divisors (10080081699).

21035277021 is a wasteful number, since it uses less digits than its factorization.

21035277021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10804016.

The product of its (nonzero) digits is 5880, while the sum is 30.

The spelling of 21035277021 in words is "twenty-one billion, thirty-five million, two hundred seventy-seven thousand, twenty-one".