149229821 has 16 divisors (see below), whose sum is σ = 166561920. Its totient is φ = 132824640.

The previous prime is 149229811. The next prime is 149229869. The reversal of 149229821 is 128922941.

149229821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-149229821 is a prime.

It is a super-4 number, since 4×149229821⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149229811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38816 + ... + 42486.

It is an arithmetic number, because the mean of its divisors is an integer number (10410120).

Almost surely, 2^149229821 is an apocalyptic number.

It is an amenable number.

149229821 is a deficient number, since it is larger than the sum of its proper divisors (17332099).

149229821 is a wasteful number, since it uses less digits than its factorization.

149229821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796.

The product of its digits is 20736, while the sum is 38.

The square root of 149229821 is about 12215.9658234623. The cubic root of 149229821 is about 530.4183489398.

It can be divided in two parts, 1492 and 29821, that added together give a palindrome (31313).

The spelling of 149229821 in words is "one hundred forty-nine million, two hundred twenty-nine thousand, eight hundred twenty-one".