20012121100209 has 16 divisors (see below), whose sum is σ = 30500748858240. Its totient is φ = 11433214721280.

The previous prime is 20012121100183. The next prime is 20012121100211. The reversal of 20012121100209 is 90200112121002.

It is not a de Polignac number, because 20012121100209 - 2²¹ = 20012119003057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20012121150209) 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, 95019402 + ... + 95229779.

It is an arithmetic number, because the mean of its divisors is an integer number (1906296803640).

Almost surely, 2^{20012121100209} is an apocalyptic number.

It is an amenable number.

20012121100209 is a deficient number, since it is larger than the sum of its proper divisors (10488627758031).

20012121100209 is a wasteful number, since it uses less digits than its factorization.

20012121100209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190254200.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 20012121100209 in words is "twenty trillion, twelve billion, one hundred twenty-one million, one hundred thousand, two hundred nine".