21510541234 has 16 divisors (see below), whose sum is σ = 39711768768. Its totient is φ = 8509664592.

The previous prime is 21510541207. The next prime is 21510541267. The reversal of 21510541234 is 43214501512.

It is a super-2 number, since 2×21510541234² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59094712 + ... + 59095075.

It is an arithmetic number, because the mean of its divisors is an integer number (2481985548).

Almost surely, 2^21510541234 is an apocalyptic number.

21510541234 is a deficient number, since it is larger than the sum of its proper divisors (18201227534).

21510541234 is a wasteful number, since it uses less digits than its factorization.

21510541234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118189809.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21510541234 in words is "twenty-one billion, five hundred ten million, five hundred forty-one thousand, two hundred thirty-four".