20312121201220 has 24 divisors (see below), whose sum is σ = 42660637161408. Its totient is φ = 8123861311200.

The previous prime is 20312121201133. The next prime is 20312121201289. The reversal of 20312121201220 is 2210212121302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61529346 + ... + 61858585.

It is an arithmetic number, because the mean of its divisors is an integer number (1777526548392).

Almost surely, 2^{20312121201220} is an apocalyptic number.

20312121201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312121201220 is an abundant number, since it is smaller than the sum of its proper divisors (22348515960188).

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

20312121201220 is a wasteful number, since it uses less digits than its factorization.

20312121201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123396171 (or 123396169 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20312121201220 its reverse (2210212121302), we get a palindrome (22522333322522).

The spelling of 20312121201220 in words is "twenty trillion, three hundred twelve billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty".