20101022100 has 72 divisors (see below), whose sum is σ = 64621072320. Its totient is φ = 5360271840.

The previous prime is 20101022069. The next prime is 20101022101. The reversal of 20101022100 is 122010102.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101022101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3719712 + ... + 3725111.

Almost surely, 2^20101022100 is an apocalyptic number.

20101022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101022100 is an abundant number, since it is smaller than the sum of its proper divisors (44520050220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20101022100 is a wasteful number, since it uses less digits than its factorization.

20101022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7444846 (or 7444833 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20101022100 its reverse (122010102), we get a palindrome (20223032202).

The spelling of 20101022100 in words is "twenty billion, one hundred one million, twenty-two thousand, one hundred".