1221210041430 has 64 divisors (see below), whose sum is σ = 3103681287168. Its totient is φ = 306463127040.

The previous prime is 1221210041383. The next prime is 1221210041431. The reversal of 1221210041430 is 341400121221.

It is a junction number, because it is equal to n+sod(n) for n = 1221210041397 and 1221210041406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221210041431) 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, 4258885 + ... + 4536575.

It is an arithmetic number, because the mean of its divisors is an integer number (48495020112).

Almost surely, 2^{1221210041430} is an apocalyptic number.

1221210041430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221210041430 is an abundant number, since it is smaller than the sum of its proper divisors (1882471245738).

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

1221210041430 is a wasteful number, since it uses less digits than its factorization.

1221210041430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286341.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1221210041430 its reverse (341400121221), we get a palindrome (1562610162651).

The spelling of 1221210041430 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, forty-one thousand, four hundred thirty".