2152021031 has 4 divisors (see below), whose sum is σ = 2152756200. Its totient is φ = 2151285864.

The previous prime is 2152021021. The next prime is 2152021037. The reversal of 2152021031 is 1301202512.

It is a happy number.

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 2152021031 - 2³⁰ = 1078279207 is a prime.

It is a super-2 number, since 2×2152021031² = 9262389035732605922, which contains 22 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 (2152021037) 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, 363176 + ... + 369053.

It is an arithmetic number, because the mean of its divisors is an integer number (538189050).

Almost surely, 2^2152021031 is an apocalyptic number.

2152021031 is a deficient number, since it is larger than the sum of its proper divisors (735169).

2152021031 is an equidigital number, since it uses as much as digits as its factorization.

2152021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735168.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2152021031 is about 46389.8806961173. The cubic root of 2152021031 is about 1291.0671679277.

Adding to 2152021031 its reverse (1301202512), we get a palindrome (3453223543).

The spelling of 2152021031 in words is "two billion, one hundred fifty-two million, twenty-one thousand, thirty-one".