121422551 has 4 divisors (see below), whose sum is σ = 128565072. Its totient is φ = 114280032.

The previous prime is 121422547. The next prime is 121422557. The reversal of 121422551 is 155224121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121422551 - 2² = 121422547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121422557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3571235 + ... + 3571268.

It is an arithmetic number, because the mean of its divisors is an integer number (32141268).

Almost surely, 2^121422551 is an apocalyptic number.

121422551 is a deficient number, since it is larger than the sum of its proper divisors (7142521).

121422551 is an equidigital number, since it uses as much as digits as its factorization.

121422551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7142520.

The product of its digits is 800, while the sum is 23.

The square root of 121422551 is about 11019.1901245055. The cubic root of 121422551 is about 495.1838258854.

Adding to 121422551 its reverse (155224121), we get a palindrome (276646672).

The spelling of 121422551 in words is "one hundred twenty-one million, four hundred twenty-two thousand, five hundred fifty-one".