21014070 has 96 divisors (see below), whose sum is σ = 63431424. Its totient is φ = 4361280.

The previous prime is 21014069. The next prime is 21014087. The reversal of 21014070 is 7041012.

It is a super-2 number, since 2×21014070² = 883182275929800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24997 + ... + 25823.

It is an arithmetic number, because the mean of its divisors is an integer number (660744).

Almost surely, 2^21014070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21014070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31715712).

21014070 is an abundant number, since it is smaller than the sum of its proper divisors (42417354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21014070 is a wasteful number, since it uses less digits than its factorization.

21014070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 21014070 is about 4584.1106007600. The cubic root of 21014070 is about 275.9540198556.

Adding to 21014070 its reverse (7041012), we get a palindrome (28055082).

The spelling of 21014070 in words is "twenty-one million, fourteen thousand, seventy".