20351635021 has 16 divisors (see below), whose sum is σ = 20796168960. Its totient is φ = 19911006720.

The previous prime is 20351635001. The next prime is 20351635043. The reversal of 20351635021 is 12053615302.

It is a cyclic number.

It is not a de Polignac number, because 20351635021 - 2²¹ = 20349537869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351635001) 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, 10830160 + ... + 10832038.

It is an arithmetic number, because the mean of its divisors is an integer number (1299760560).

Almost surely, 2^20351635021 is an apocalyptic number.

It is an amenable number.

20351635021 is a deficient number, since it is larger than the sum of its proper divisors (444533939).

20351635021 is a wasteful number, since it uses less digits than its factorization.

20351635021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 20351635021 in words is "twenty billion, three hundred fifty-one million, six hundred thirty-five thousand, twenty-one".