1621802729412 has 48 divisors (see below), whose sum is σ = 4307226772800. Its totient is φ = 527415520320.

The previous prime is 1621802729411. The next prime is 1621802729413. The reversal of 1621802729412 is 2149272081261.

1621802729412 is a `hidden beast` number, since 1 + 621 + 8 + 0 + 2 + 7 + 2 + 9 + 4 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (1621802729411) and next prime (1621802729413).

It is not an unprimeable number, because it can be changed into a prime (1621802729411) 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, 183125962 + ... + 183134817.

It is an arithmetic number, because the mean of its divisors is an integer number (89733891100).

Almost surely, 2^{1621802729412} is an apocalyptic number.

1621802729412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621802729412 is an abundant number, since it is smaller than the sum of its proper divisors (2685424043388).

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

1621802729412 is a wasteful number, since it uses less digits than its factorization.

1621802729412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366260833 (or 366260825 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 1621802729412 in words is "one trillion, six hundred twenty-one billion, eight hundred two million, seven hundred twenty-nine thousand, four hundred twelve".