121221223021420 has 24 divisors (see below), whose sum is σ = 254565082586304. Its totient is φ = 48488391257856.

The previous prime is 121221223021399. The next prime is 121221223021433. The reversal of 121221223021420 is 24120322122121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4473444 + ... + 16200436.

It is an arithmetic number, because the mean of its divisors is an integer number (10606878441096).

Almost surely, 2^{121221223021420} is an apocalyptic number.

121221223021420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221223021420 is an abundant number, since it is smaller than the sum of its proper divisors (133343859564884).

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

121221223021420 is a wasteful number, since it uses less digits than its factorization.

121221223021420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12243849 (or 12243847 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 121221223021420 its reverse (24120322122121), we get a palindrome (145341545143541).

The spelling of 121221223021420 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-three million, twenty-one thousand, four hundred twenty".