151521021 has 12 divisors (see below), whose sum is σ = 219212448. Its totient is φ = 100853064.

The previous prime is 151521001. The next prime is 151521023. The reversal of 151521021 is 120125151.

It is not a de Polignac number, because 151521021 - 2⁷ = 151520893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 151520985 and 151521003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151521023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7305 + ... + 18878.

It is an arithmetic number, because the mean of its divisors is an integer number (18267704).

Almost surely, 2^151521021 is an apocalyptic number.

It is an amenable number.

151521021 is a deficient number, since it is larger than the sum of its proper divisors (67691427).

151521021 is a wasteful number, since it uses less digits than its factorization.

151521021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26832 (or 26829 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 151521021 is about 12309.3875152259. The cubic root of 151521021 is about 533.1191660496.

Adding to 151521021 its reverse (120125151), we get a palindrome (271646172).

The spelling of 151521021 in words is "one hundred fifty-one million, five hundred twenty-one thousand, twenty-one".