21121602 has 16 divisors (see below), whose sum is σ = 43606272. Its totient is φ = 6813360.

The previous prime is 21121547. The next prime is 21121603. The reversal of 21121602 is 20612112.

It is a super-2 number, since 2×21121602² = 892244142092808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56593 + ... + 56964.

It is an arithmetic number, because the mean of its divisors is an integer number (2725392).

Almost surely, 2^21121602 is an apocalyptic number.

21121602 is an abundant number, since it is smaller than the sum of its proper divisors (22484670).

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

21121602 is a wasteful number, since it uses less digits than its factorization.

21121602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113593.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21121602 is about 4595.8244091784. The cubic root of 21121602 is about 276.4239179745.

Adding to 21121602 its reverse (20612112), we get a palindrome (41733714).

The spelling of 21121602 in words is "twenty-one million, one hundred twenty-one thousand, six hundred two".