2151421015 has 12 divisors (see below), whose sum is σ = 2724738264. Its totient is φ = 1630549296.

The previous prime is 2151421001. The next prime is 2151421031. The reversal of 2151421015 is 5101241512.

It is not a de Polignac number, because 2151421015 - 2²¹ = 2149323863 is a prime.

It is a super-2 number, since 2×2151421015² = 9257224767567260450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 594157 + ... + 597766.

It is an arithmetic number, because the mean of its divisors is an integer number (227061522).

Almost surely, 2^2151421015 is an apocalyptic number.

2151421015 is a deficient number, since it is larger than the sum of its proper divisors (573317249).

2151421015 is a wasteful number, since it uses less digits than its factorization.

2151421015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191966 (or 1191947 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 2151421015 is about 46383.4131452182. The cubic root of 2151421015 is about 1290.9471670922.

Adding to 2151421015 its reverse (5101241512), we get a palindrome (7252662527).

The spelling of 2151421015 in words is "two billion, one hundred fifty-one million, four hundred twenty-one thousand, fifteen".