1211211010020 has 48 divisors (see below), whose sum is σ = 3699699087168. Its totient is φ = 293626911360.

The previous prime is 1211211009977. The next prime is 1211211010133. The reversal of 1211211010020 is 200101121121.

It is a super-3 number, since 3×1211211010020³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1211211009978 and 1211211010005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 917583439 + ... + 917584758.

It is an arithmetic number, because the mean of its divisors is an integer number (77077064316).

Almost surely, 2^{1211211010020} is an apocalyptic number.

1211211010020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211211010020 is an abundant number, since it is smaller than the sum of its proper divisors (2488488077148).

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

1211211010020 is a wasteful number, since it uses less digits than its factorization.

1211211010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835168220 (or 1835168218 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1211211010020 its reverse (200101121121), we get a palindrome (1411312131141).

The spelling of 1211211010020 in words is "one trillion, two hundred eleven billion, two hundred eleven million, ten thousand, twenty".