1221401699700 has 576 divisors, whose sum is σ = 4484437977600. Its totient is φ = 255018516480.

The previous prime is 1221401699669. The next prime is 1221401699747. The reversal of 1221401699700 is 79961041221.

It is a super-2 number, since 2×1221401699700² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 129752194 + ... + 129761606.

It is an arithmetic number, because the mean of its divisors is an integer number (7785482600).

Almost surely, 2^{1221401699700} is an apocalyptic number.

1221401699700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221401699700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2242218988800).

1221401699700 is an abundant number, since it is smaller than the sum of its proper divisors (3263036277900).

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

1221401699700 is a wasteful number, since it uses less digits than its factorization.

1221401699700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9561 (or 9540 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The spelling of 1221401699700 in words is "one trillion, two hundred twenty-one billion, four hundred one million, six hundred ninety-nine thousand, seven hundred".