122155152421 has 2 divisors, whose sum is σ = 122155152422. Its totient is φ = 122155152420.

The previous prime is 122155152403. The next prime is 122155152439. The reversal of 122155152421 is 124251551221.

It is a balanced prime because it is at equal distance from previous prime (122155152403) and next prime (122155152439).

It can be written as a sum of positive squares in only one way, i.e., 121483617025 + 671535396 = 348545^2 + 25914^2 .

It is a cyclic number.

It is not a de Polignac number, because 122155152421 - 2¹³ = 122155144229 is a prime.

It is a super-2 number, since 2×122155152421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122155152461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61077576210 + 61077576211.

It is an arithmetic number, because the mean of its divisors is an integer number (61077576211).

Almost surely, 2^122155152421 is an apocalyptic number.

It is an amenable number.

122155152421 is a deficient number, since it is larger than the sum of its proper divisors (1).

122155152421 is an equidigital number, since it uses as much as digits as its factorization.

122155152421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8000, while the sum is 31.

It can be divided in two parts, 122155 and 152421, that added together give a square (274576 = 524²).

The spelling of 122155152421 in words is "one hundred twenty-two billion, one hundred fifty-five million, one hundred fifty-two thousand, four hundred twenty-one".