155030032021 has 2 divisors, whose sum is σ = 155030032022. Its totient is φ = 155030032020.

The previous prime is 155030032009. The next prime is 155030032043. The reversal of 155030032021 is 120230030551.

It is an a-pointer prime, because the next prime (155030032043) can be obtained adding 155030032021 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134314187121 + 20715844900 = 366489^2 + 143930^2 .

It is an emirp because it is prime and its reverse (120230030551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155030032021 - 2²¹ = 155027934869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155030031983 and 155030032001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155030032061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77515016010 + 77515016011.

It is an arithmetic number, because the mean of its divisors is an integer number (77515016011).

Almost surely, 2^155030032021 is an apocalyptic number.

It is an amenable number.

155030032021 is a deficient number, since it is larger than the sum of its proper divisors (1).

155030032021 is an equidigital number, since it uses as much as digits as its factorization.

155030032021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

Adding to 155030032021 its reverse (120230030551), we get a palindrome (275260062572).

The spelling of 155030032021 in words is "one hundred fifty-five billion, thirty million, thirty-two thousand, twenty-one".