1221431402020 has 24 divisors (see below), whose sum is σ = 2566413045504. Its totient is φ = 488304541536.

The previous prime is 1221431401999. The next prime is 1221431402033. The reversal of 1221431402020 is 202041341221.

It is a junction number, because it is equal to n+sod(n) for n = 1221431401982 and 1221431402000.

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 7 ways as a sum of consecutive naturals, for example, 16713834 + ... + 16786753.

It is an arithmetic number, because the mean of its divisors is an integer number (106933876896).

Almost surely, 2^{1221431402020} is an apocalyptic number.

1221431402020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221431402020 is an abundant number, since it is smaller than the sum of its proper divisors (1344981643484).

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

1221431402020 is a wasteful number, since it uses less digits than its factorization.

1221431402020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33502419 (or 33502417 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 1221431402020 its reverse (202041341221), we get a palindrome (1423472743241).

The spelling of 1221431402020 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-one million, four hundred two thousand, twenty".