1221420002430 has 64 divisors (see below), whose sum is σ = 2975988791808. Its totient is φ = 320761288320.

The previous prime is 1221420002329. The next prime is 1221420002437. The reversal of 1221420002430 is 342000241221.

It is a super-2 number, since 2×1221420002430² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221420002397 and 1221420002406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221420002437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7295944 + ... + 7461476.

It is an arithmetic number, because the mean of its divisors is an integer number (46499824872).

Almost surely, 2^{1221420002430} is an apocalyptic number.

1221420002430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221420002430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1487994395904).

1221420002430 is an abundant number, since it is smaller than the sum of its proper divisors (1754568789378).

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

1221420002430 is a wasteful number, since it uses less digits than its factorization.

1221420002430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169281.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 1221420002430 its reverse (342000241221), we get a palindrome (1563420243651).

The spelling of 1221420002430 in words is "one trillion, two hundred twenty-one billion, four hundred twenty million, two thousand, four hundred thirty".