20213100021 has 8 divisors (see below), whose sum is σ = 27880138080. Its totient is φ = 13010730992.

The previous prime is 20213099993. The next prime is 20213100023. The reversal of 20213100021 is 12000131202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20213100021 - 2⁵ = 20213099989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213100023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116167155 + ... + 116167328.

It is an arithmetic number, because the mean of its divisors is an integer number (3485017260).

Almost surely, 2^20213100021 is an apocalyptic number.

It is an amenable number.

20213100021 is a deficient number, since it is larger than the sum of its proper divisors (7667038059).

20213100021 is a wasteful number, since it uses less digits than its factorization.

20213100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232334515.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20213100021 its reverse (12000131202), we get a palindrome (32213231223).

The spelling of 20213100021 in words is "twenty billion, two hundred thirteen million, one hundred thousand, twenty-one".