1212202020021 has 16 divisors (see below), whose sum is σ = 1642944113664. Its totient is φ = 794834823024.

The previous prime is 1212202020013. The next prime is 1212202020047. The reversal of 1212202020021 is 1200202022121.

It is not a de Polignac number, because 1212202020021 - 2³ = 1212202020013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212202020011) 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, 4560381 + ... + 4818866.

It is an arithmetic number, because the mean of its divisors is an integer number (102684007104).

Almost surely, 2^{1212202020021} is an apocalyptic number.

It is an amenable number.

1212202020021 is a deficient number, since it is larger than the sum of its proper divisors (430742093643).

1212202020021 is an equidigital number, since it uses as much as digits as its factorization.

1212202020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9379960.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1212202020021 its reverse (1200202022121), we get a palindrome (2412404042142).

The spelling of 1212202020021 in words is "one trillion, two hundred twelve billion, two hundred two million, twenty thousand, twenty-one".